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The first day of my last period was December 28th.

6 answers
The first day of my last period was December 28th. I went to the doctor Monday which was March 1st and they said I was 9 weeks and 4 days pregnant. They said the date of conception was January 11th. How is that possible if I am 9 weeks and 4 days date of conceptions would be December 24th. I am now not sure who the father is. How long does a paternity test take?

answers (6)

I am not sure the reason, but doctors figure your due date as 40 weeks from the first day of your last period and not the date of conception.  So even though you were not actually pregnant at that time, it is still considered part of your 40 weeks.  The father is likely the person that you were with on January 11th-give or take a few days because due dates are not 100% accurate.  Also, unless you have a test done during pregnancy (amniocentesis) to confirm paternity then a test cannot be done until after baby is born and I have no idea how long that takes. Good Luck!
i just went to the doctor yesterday and the first day of my last period was jan 27. and the doctor said i was 5 weeks. this is only a one day difference, so whats up with the 4 week difference in conception
If your period was December 28th, and you usually have a 28 day cycle, than you would have conceived around January 11th, 2010, and will be due around October 4th, 2010. If they are basing 9 weeks and 4 days off of an ultrasound, than it is probably accurate, meaning you would have ovulated very early in your cycle... around January 1st. Also, keep in mind that sperm can live up to 3 days inside of you, so it's not necessarily whomever you slept with on the day you supposedly conceived, but also the 3-4 days prior to that up to a couple days after you ovulate. It sucks that you don't know who the father is, and I don't know anything about paternity tests so I can't help you there... but I would like to remind you that having unprotected sex with numerous partners does increase your risk for std and infections... which is especially important now that you are pregnant. Congratulations on your baby!
doctors start counting on the first day of your last period
Technically you're not pregnant for the first two weeks of your pregnancy. I don't completely understand it but you concieve two weeks after the 1st day of your last period and your doctor figures out your due date by that date. As apposed to asking you the dates that you had sex...cuz there really isn't any way to tell when you concieved by when you had sex. My friend had a paternity test when she was pregnant, if I remember correctly it took a month or so to get the results. You do have to have blood from one of the guys though.
Whoever you were with around January 11th is the father. Pregnancy is counted from the first day of your last period, so like everyone says the first 2 weeks of your pregnancy you are not technically pregnant.  This is the same for all of us pregnant women. Trust that your doctor has done this hundreds of times and knows what he/she is talking about. Good luck.  I hope knowing that you concieved around jan 11th has helped narrow down the dad.  I don't know how long it takes to get a paternity test back and i think it is safest to be done after baby is born. Hang in there.

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