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who’s the father

hello i am a very worried mom to be... this is my first child. i had sex with Guy A on Feb21st and then with Guy B on March 17th... i had an early ultrasound on May 1st where they told me that i was 8 weeks and 5 days.. (with this information i would say Guy B would be the father) ... but i just had my second ultrasound on June 14th where thy told my i was 15 weeks 4 days.... that’s a week difference from the original dates i was given.. could Guy A be a possibility ?? i’m not sure... idr when my last period was i believe it was March 2nd but i’m not 100% sure that it was or wasn’t my period.. could i have been pregnant already and that may have been implantation bleeding ?? i’m so confused and i need answers:(
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134578 tn?1693250592
COMMUNITY LEADER
When you had your first ultrasound, what date did they tell you was your estimated due date?
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In fact, when you had the ultrasound just this past week, what did they tell you was your estimated due date?

Sometimes women get wrapped around the wheel when using GA (weeks) counts, you are a lot better off using the due dates when trying to make this kind of calculations. I don't see these GAs as being a week off each other.
the first time was december 8 now december 4
according to my first ultrasound which was performed May 1st, i was 8 weeks 5 days. going off of this on June 14th i should have been 14 weeks and 5 days.. but they said i was 15 weeks and 4 days which is almost a whole week off from the original Ultrasound..
pls help :(
Well, if you absolutely have to mess with the weeks counts (where everyone always gets tangled up) and not pay attention to the due dates, where you say "going off this on June 14 i should have been 14 weeks 5 days," I think that you counted wrong. On June 12 (not June 14) you should have been 14 weeks 5 days, and on June 14 you should have been 15 weeks 0 days. Meaning, only 4 days' difference, not "almost a whole week." Unless you think 4 days is almost a whole week.

Am I correct in thinking that you said the two guys were 24 days apart And yet on the basis of only a 4-day discrepancy, you are ready to disregard your doctor's ability to read an ultrasound and know the difference between an embryo conceived 3 weeks earlier and one conceived 3 weeks later, and also to explain away your period as (that favorite of all Internet myths), "implantation bleeding"? Just because there was 4 days' difference? I would not even do that for a week's difference, myself.  

First of all, I will put into your worried ear a reminder. You go to a doctor because he or she has had years of medical school, internship, practice and continuing training. If you don't believe your doctor can discern the development of a baby by ultrasound that was conceived three weeks earlier versus three weeks later, don't go to the doctor. All I'm saying is that it is possible anxiety is clouding your thinking.

I am also wondering if the doctor told you the estimated due date when looking at the ultrasound screen, or if you went home and did the rest of the figuring on your own.  The part that is a little odd is that if you were told you were 8 weeks 5 days GA on May 1, the doc should have told you a due date of December 6, not December 8. And if an ultrasound on June 14 told you 15 weeks 4 days, the doctor should have told you a due date of December 2. But in any case, it doesn't matter.

A later ultrasound is less useful for trying to determine conception than an earlier ultrasound. It is hardly a surprise that you might get a 4-day discrepancy weeks later. This is because only ultrasounds in the 6th or 7th week are ever reliably spot-on for determining when you conceived. By the 8th week, the margin for error is +/- 3 days. By the 12th week, most doctors will say +/- 7 days, and by the 40th week, the margin for error is 3 weeks either way. Some babies' due dates never change, some babies' due dates change a lot, but whether they change or not is related to how fast or slowly they grow, not any change in their conception date.

This is because embryos can grow at different rates than the average growth curve. Divergence begins (if it does) after about the 7th week or so. This means later ultrasounds aren't as reliable as earlier ultrasounds for determining the date of conception. It is not particularly surprising that your 15th week ultrasound would have given you a due date 4 days' different than your 8th week ultrasound gave you. It just means your baby is growing a little faster than average. It says nothing about when the baby began.

So, let's think about the anxiety that caused you to translate a 4-day discrepancy into a whole scenario with incompetent doctor and mythical period-that-is-not-really-a-period. "Certainty seeking" behavior comes when the brain is super eager or super bothered by the need for an absolute and total sure answer to something that is bothering it. I don't think what is really (deep down) worrying you is that the earlier guy is the dad, the dates don't support it. Is it something else, like, you are sorry the earlier guy even existed? Or, something else about supporting this baby? It's a good idea to try to keep your worries up front in the form that they arrived in, and don't put them onto straw men like worrying that a guy 24 days earlier is probably the dad because the ultrasound indicated a 4-day change. You can't address your worries if you hang them on the wrong thing, because no amount of answering the wrong thing will satisfy the worry.
thank you
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