Sorry, typing too fast. Where I said "Your due dates of February 9 and February 11 come out to conception dates of November 2 and November 4, respectively," I meant to say "Your due dates of November 2 and November 4 come out to conception dates of February 9 and February 11, respectively." This stuff is difficult enough without me reversing the dates. :)
One does not count back exactly 40 weeks from the due date to get the conception date, one counts back exactly 40 weeks from the due date to get the "gestational age" count (the medical way of counting, which is used by doctors, nurses, ultrasounds, ultrasound techs, medical textbooks, etc.) begins on the first day of your last period, or on the computed first day of your last period (if your periods are not regular, or if you missed one for another reason).
Back in grandma's day, and great-grandma's, the ONLY signal doctors had to base the beginning of a count of pregnancy on was the first day of the last period. So, doctors would begin the "gestational" count (the count of weeks) on that day. It is a big, obvious signal, the woman is bleeding, she often knows when that was. Two weeks or so later, a hidden event happens, ovulation, and conception. Even today, doctors have no way to know when that happens. Later in the pregnancy (like around the 7th week), they can measure the embryo and make educated guesses about when conception occurred, but they can't know at the moment of ovulation unless the woman does IVF. So, all pregnancy-count starting dates are still calibrated to the first day of the last period, even today in the age of ultrasounds. The first two weeks of a 40-week pregnancy count, are basically an allowance to move from the period to ovulation EVEN THOUGH the women is not pregnant on day 1 of her period, or day 2, or day 3, or even up to day 14.
Pregnancy from conception to full term is 266 days. The 280-day count (40 weeks) is used to count back to the first day of the last period.
This is why no doctor says "You're one week pregnant" or "You're two weeks pregnant," after all, that is just the time gap between the last period and the upcoming ovulation, and besides, there is no way to test for pregnancy until about the 4th week. A person with regular cycles would ovulate around day 14 of their cycle. Then a pregnancy test would be able to pick up the pregnancy around day 28 of the cycle. This counts as 4 weeks "pregnant," though the person only ovulated and conceived 2 weeks back.
Your due dates of February 9 and February 11 come out to conception dates of November 2 and November 4, respectively. I've used an online conception calculator, but you would probably get something similar by counting back 266 days from your due date.
It is more reliable to use the information from an ultrasound (as long as it was early in the pregnancy, like before the 10th or 11th week) to determine when conception might have occurred, than it is to use the first day of the last period and to count forward. After all, a woman can miss a period and get pregnant the next month, she can have a chemical pregnancy followed by a viable pregnancy, or she can be irregular in her cycle from stress or "just because." I cannot see that you would have gotten two ultrasounds that both pointed to around February 9 (especially since they were both early ultrasounds) if you had conceived in January. Later ultrasounds can have a margin for error of up to three weeks, by the end of pregnancy, but not in the early days. All embryos begin as one cell, and enlarge at a relatively standard rate for a while, only diverging from average growth rates (if they ever do) later than the 10th week.
You had sex with your boyfriend on January 26. We could postulate that perhaps the sperm stayed in your system and was viable until the 31st. But that still doesn't stretch to reach you ovulating on the 9th or 11th of February.
I don't know why your period was AWOL in January, but I don't see it as being evidence you were already pregnant (unless you had had a chemical pregnancy, which can make your period go away).
If this is a major problem for you, there are a couple of reliable labs (not the Internet cheapies) who do prenatal DNA testing. Most of the ladies on this site don't go that route because DNA testing is a tenth as costly after the baby is born, but if you do decide you need to do this, I'd recommend Ravgen or the DDC.
I'm sorry, but the way you are describing things, it really does sound much more like the guy in February is the dad.
But if you count exactly 40 weeks from my due date it's January 26. How could conception be on February 9th is that isn't 40 weeks
Pretty much everything you are saying except the fact that you didn't have a period in January points to conception around February 9. Both ultrasounds indicate conception February 9 -11, which would be possible with sex February 7. This is why I asked how regular your cycles are. Do you have a period every 28 - 30 days usually?
I'm currently with my boyfriend for 3 years (the one from January)
I spotted for one day on January 27 do that makes me think that I conceived in January but if you count 7 days from jan 26th it isn't to February 7th maybe it implanted before.
It can be any of them... The ultrasound technician goes based off of measurements of the baby its the most accurate way, but as always its not exact. If on march 1st you were 4 weeks and 6 days you conceived around February 2. Sperm can stay in the vagina for up to 5 days, you had sex with guy number 1 on the 26th of Jan add 5 days that means it could have been him. Or you had sex with guy number 2 on February 2 which also makes it possible to have conceived with him. Why dont you ask the doctor for the blood type of the baby and find out if it matches any of the two you had sex with. if not the only thing to do would be to take a paternity test once the baby is born. Don't freak out though and concentrate on baby its a blessing anyways!
Hi, Nicole, how regular are your periods? When I go over your dates, I get one set of answers from the ultrasounds and another from your period. This is not uncommon, and the ultrasounds are more reliable than your period, but it seems like you would have had a period in January.
They said they were going off a 40 week scale when I got the ultrasound since I didnt tell them my last period
My last period was December 25 2014
I think looking at it probably the 2nd guys but that's going off your due date! Annie may be able to help you she's very good at this x