Accuracy sonogram dating

I know that with my husband, both times we wanted to get pregnant it took a few months just because of how his and my body work together...

Hope this helps I need to know the possibilities: on the 1st dec I started my periods and had unprotected sex with one of my boyfriends then on the 10th dec I had unprotected sex again with my other boyfriend.

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At 6 weeks I found out I was pregnant however the doctor said I would have had sex on the 7th dec which is impossible because I never had sex on that day.

My delivery date was 5 Sept however as time progressed my delivery date changed to 12/13 Sept but the doctor said its only because the feotus was getting bigger.

I will be doing a dna test for peace of mind however I just needed to get clarity before I run a test on both fathers whereas I can just do it on the one and save cost. You ovulate around 14 days after the first day of you period(assuming that you have a 28 day cycle). I think it is pretty unlikely that you got pregnant from sex on the first day of your period.

I went in to the OBGYN today to go over blood tests that I'd submitted a few weeks ago, and for what I thought was an ...but, turns out I'm farther along than I thought, and I'm 10 weeks and 1 day (instead of 8 5)!

Could one show you being 8 weeks a long when your actually 11-12 weeks? The way they determine the age is based on the size in comparision to the average.

Generally they are pretty accurate - I have seen them out no more than a week. They measured my baby on the scan and he/she measures exactly to the dates of my last period, ovulation day and implantation day.

My question is what is the posibility that I got pregnant when I had sex during my periods or would I have gotten pregnant from my second boyfriend.

This whole thing confuses ne because would his sperm have survived this long to inpregnate me during my periods or should I just believe that my second boyfriend is da father and that the 6 weeks scan did not give a true reflection.

x I went for an ultrasound when i was 11 weeks and baby only measured 9.

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