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Avatar universal

conception??!help!confused.

hi, so im 12weeks 2days preg, my lmp was around the 7th-10th of feb 2014, i had been ttc for the last 3 years with my current partner no luck. i slept with him everyday up untill the 28th of feb.. then i.had a one night stand on the.10th march.2014.. a week later i. found. out i. was preg. on the.8th of.april i.had a ultrasound where i foumd out i was preg with TWINS, i told themi didnt. know my lmp but the mesurments put me at.6 weeks for 1 baby and 5weeks 6days for the other, i. then had another scan on.15th of may which put me 11weels 1day. when. i count back that goes to ,27th of feb..... i really need some advise. could it be off by 10days?? chances of it being the other guy?  im so worried i will lose everything... plshelp!
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134578 tn?1693250592
COMMUNITY LEADER
Well, with the resources I have at my disposal (there are a lot of crown-rump length charts online, you might try it) the 4.4 measurement sounds like it is using the GA count (in other words, the 11 weeks beginning on the first day of your last period).  If that is right, you still can't rule out the guy you're trying to rule out.  Write this all down, and at your next doctor's appointment when he or she has your file right there, talk with your doctor honestly about what is going on.  I have never heard of a doctor's office giving a woman the count 'only' using conception counts, if they do give a woman an estimated date of conception it is something they have to think about and work on, it's not the natural way for an ob-gyn office to think about pregnancy timing.  I would suspect they have been using the GA type of count when they tell you weeks, but the only way you can confirm this is by getting your estimated due date from them based on the first ultrasound and then counting back.
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Avatar universal
the crl was 0.3mm at 6 weeks an 4.4 at 11weeks
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134578 tn?1693250592
COMMUNITY LEADER
I don't think this is an exact science, but what was the crown-rump measurement of either baby at 6 weeks?  I might be able to compare to the results of some of the other ladies and make a guess about whether they were telling you a gestational age when they said 6 weeks, or a conception age.
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134578 tn?1693250592
COMMUNITY LEADER
The other way to approach this is to ask them when your estimated due date is, and to be sure that the estimated due date comes from either your earliest ultrasound or from your second one.  In other words, not from some flakey estimate of when your last period might have been.  Then armed with that date, go home and put it into a conception calculator, or just count back from it on a calendar 266 days.  

I don't know why a doctor would use 14 weeks for GA and 11 weeks for conception, it doesn't match any form of counting I've heard of unless the doc is noting that you said your period began on a date 14 weeks ago but that the baby is measuring at a GA of 11 weeks.  The only way to work that question out is by a lot of careful questioning of the doctor who has your charts open and is taking the time to figure out what happened.  From the way you told the story, you had one ultrasound that gave you 6 weeks and one that gave you 11, and nobody at that point in your story (at least the way you told it) was saying they were taking away two weeks in order to compute to a conception date, it all sounded like they were talking about your GA.  So therefore I can't help you on what 14 weeks 4 days might have meant.

If the 11 weeks and the 6 weeks were GA, then you do have an issue with the two guys.
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134578 tn?1693250592
COMMUNITY LEADER
I guess it is possible that there are doctors out there who count it out both ways, one being the GA (from the first day of the last period) and the other being from conception.  But it doesn't make a lot of sense to tell someone on the same day that they were 11 weeks since conception and 14 weeks from the first day of their last period, because doctors and ultrasounds always allow two weeks, not three, for that difference.

All you can do is go back and ask the actual doctor.  Tell him your dillemma.  Unfortunately, both the date of being 6w0 on April 8 and 11w1 on May 15 tend to pinpoint the wrong guy.  But if they are telling you those dates (6w0 and 11w1) to tell you when you conceived and not when your period began, they need to clarify it to you.  That would confuse things based on the usual use of a GA for all pregnancy counts, but who knows, maybe they are trying to be helpful.

Ask the doctor, not some nurse who wasn't even necessarily in the room.
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Avatar universal
They said crl dates from when I concived. Is this a lie?  :(
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Avatar universal
The first ultrasound they said I was exactly 6weeks in the 8the of April. They didn't give Me a edd,  on the. 15th of may my ultrasound said 11weeks one day by the cell but the "ga " was 14weeks which the nurse said ment a estimation of my lmp  as I. Didn't know it.
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134578 tn?1693250592
COMMUNITY LEADER
In other words, when you had your first ultrasound, what number of weeks did they say you were, and what estimated due date did they give you then?  You said above that on May 15, you were 11w1d.  -- ("i also had a.ultrasoumd on the.15th of may which put me at 11weeks 1day. so today on the 25th/05 i am 12weeks 4days.")  Now you are saying "on your ultrasound," (is that the one from May 15???) "it says 14 weeks 4 days."  Which is it?
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134578 tn?1693250592
COMMUNITY LEADER
crl is the abbreviation for crown-to-rump length, and it measures body length -- the embryo from the top of the head to the bottom of the bottom.  Are you saying that you think the size of the twins is related somehow to being only 11 weeks pregnant?  
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Avatar universal
thank you so much
,bt this is where i get confused, on my ultrasound it says 14weeks 4days. yet the crl of the twins shows only 11weeks would this still mean i concevided in march
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134578 tn?1693250592
COMMUNITY LEADER
Hi, flower.  All medical counts of pregnancy (the "weeks" number -- 11 weeks 1 day, 12 weeks 4 days), if given to you by a medical person or medical textbook or even the books like "A Child Is Born," and "Your Pregnancy Week by Week" are done with a GA count.  That stands for gestational age, which count in fact begins on the first day of your last period, or (if the woman's periods are unknown or irregular) on a computed first day of your last period.  This means, if a doctor says to a woman, "Congratulations, you are 8 weeks pregnant!" he means 6 weeks since conception. The count is done this way because the period is a big, obvious signal, not because the doctor thinks you are pregnant when you are on day 1 of your cycle.  (He knows you were not, you were having a period!)  But for many generations, the period and its absence have been the only place to begin a pregnancy count, since ultrasounds have only been available for maybe 20 years and widely used for less than that.  

That's why pregnancy, which takes 38 weeks from conception to full-term birth, is counted as being 40 weeks long.  They add a spare two weeks at the front to count things back to the presumed first day of the last period, so they can use the standard charts and graphs to measure the pregnancy's progress. That medical way of counting might be confusing at first, but it is how all the computations and textbooks are done, and that is why it is still used.  (And in many places, even today, a woman has no access to an ultrasound at week 6 or 8 to see how far along she is, so starting with day 1 of bleeding is the best she's got.)

If your cycles are long or irregular, you could have ovulated any time between your visible last period and when the next one would have been expected.  But once you have an ultrasound, it doesn't in fact matter when the last period was.  The ultrasound trumps.  They look carefully at the embryo, measure it crown-to-rump and note developmental markers, and their database tells how far along it is.  

Think of an embryo, it begins as one cell.  Then it is fertilized and the next day it splits into two cells, the next day into four, and the next day into 8.  A scientist watching through a very powerful microscope would be able to see this happening and note this pace.  He could say, "8 cells?  That embryo is 4 days old."  But after a while in pregnancy, it is not as possible to say (as it would be at the day when the embryo was 8 cells) 'this embryo is 4 days old," but it *is* possible to do that with a pretty close amount of accuracy up to about the 9th week of pregnancy.  (And I'm using the GA version of a count here, in other words, I'm saying the 7th week since conception.)  

At or after the 12th week, many doctors will give a margin for error of +/- 7 days when using an ultrasound observation for dating a pregnancy.  That is because after a while, some babies might grow a little faster and some a little slower.  But if your ultrasound was early enough (and I think 11w1d is pretty early, maybe it has a margin for error of +/- 3 or 4 days) it will be pretty reliable at this early point for dating conception.

This means that when you look at a calendar, having an 11w1d ultrasound on May 15 gives you the following, with a margin for error that is not huge (as I said, perhaps plus or minus 3 or 4 days):

     Probable date of ovulation:  March 12
     Possible dates of conception:  March 8 to March 16
     Due date:  December 3 (40 weeks)

As you can see, this is not the best of news for you, since it points to the guy you do not want, with your boyfriend on the 15th having more of an outside chance.  If your boyfriend had been four days *before* your ovulation, his sperm would have been in your system and still viable on the 12th, and I would tell you the entire picture gives each guy a 50/50 chance.  But since your time with him was not until four days *after* your projected ovulation based on your ultrasound measurements, well, since an egg only lasts in a woman's body about 24-36 hours (unlike sperm, that has a longer life), well, again, your chances of it being your boyfriend's baby hinge entirely on that margin for error.  

You say "I am so worried I will lose everything."  

Sweetheart, listen to Auntie AnnieBrooke.  I dealt with infertility for 20 years.  My husband and I have spent at least a hundred thousand dollars on attempts to get pregnant, and even today after all of that are working on trying for a second child by that same expensive, costly and sad route (IVF is not a lot of fun.)  I lost my ability to have children naturally due to a ruptured appendix and the attendant infection when I was 17, and it has affected my whole life for years.  You are going to have a baby.  You are not "losing everything."  You are winning!!!!!

I am sorry and of course understand that if it is your partner you really love with your whole heart, you have a difficult conversation coming up and might lose him.  But you will not lose the child.

You can have a DNA test done by simple blood draw before the baby is born, if you want.  But that kind of test is very costly, and it would not matter to most women to do it (they would rather save the $2,000 for the baby's needs) because they would not have an abortion even if the wrong guy turned out to be the dad.  You can have a DNA test done once the baby is born, by simple swab, and I've heard anywhere from $175 to $250 for the test once the baby is here.  I don't want to ruin your life by saying all of this about DNA tests, but you do need to do one.  It is only fair to both men, and to the baby, and to you, to know the baby's paternity.

I wish this was better news for you, but life does not always work the way we would like, I am here to tell you from my own infertility struggles and the tears they have cost.  This does not mean you have nothing left.  In my book and that of many, many other women dealing with infertility, you are the lucky one.

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Avatar universal
and i also had a.ultrasoumd on the.15th of may which put me at 11weeks 1day. so today on the 25th/05 i am 12weeks 4days. if i count back that takes me to the 28th of may, and that couldnt be based on lmp because i clearly remember not having one around that time... im soooo comnfused
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Avatar universal
h i found out via hometest (clearblue digital) on the 22 of march (the test said.3+) i then had a ultra sound on the 8th of april which put me at 6weeks.
yes i had been only sleeping withmy long term partner till the 28th of feb then i Had ONE one night stand on the 10th of march then i had slept with my partner on the 15th....
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134578 tn?1693250592
COMMUNITY LEADER
Also, by what method did you first learn you were pregnant, a home test?  
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134578 tn?1693250592
COMMUNITY LEADER
It's kind of hard to understand this part of your post: i slept with him everyday up untill the 28th of feb.. then i.had a one night stand on the.10th march.2014.. a week later i. found. out i. was preg. on the.8th of.april

Do you mean that you had a one-night stand March 10, and then found out on March 17 that you were pregnant?  Is that what the "a week later" refers to?  Or do you mean that you had a one-night stand on March 10 and a week later, meaning on March 10 and 17 with the non-boyfriend, and then on the 8th of April you found out you were pregnant?

I ask because if you learned you were pregnant on March 17 after having a one-night stand on March 10, that is pretty rapid to learn you are pregnant after having sex.

On the other hand, your conception dates don't exactly count the March 10 guy out.  Did you also have sex with your partner around March 10?  Or was February 28 the last time for a while?
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