are conception dates accurate?

[kabump]

hi, i slept with someone one the 17th dec. then i slept with my new partner on the 20th through out,i had a period on the 27th i got pregnant, they said my conception date was the 30th december, what are the chances of it being the lad from the 17th? pleasee help!!!

[Motherhoodo12]

Sounds like u,had sex in jan also

[Motherhoodo12]

Im due a few weeks after u & i got pregnant towards the end of jan. My cycle.hn is irregular so i didnt have a period in jan..but that when i conceived

[Motherhoodo12]

Your conception date should be sometime @the beginning of jan....

[sadies93]

I got pregnant while on my period. so its possible. I think it was meant for me to have a baby tho, I was on my period, birth control and used a condom and im 27weeks now lol.

All we can do is guess who the dad is, only a DNA test will tell you for sure, if I had to guess id say the second guy.

[sehale]

Are you sure you didn't have sex after your period. A first trimester ultrasound can be off, but it wouldn't be off by two weeks.

[AnnieBrooke]

All medical counting of pregnancy is done from the first day of the last period, because that is usually a known date with a visible signal (the starting of bleeding).  This is true even though of course every doctor would tell you that on the first day of your last period, you were having a period, you weren't pregnant yet.  They count from that point (day 1 of bleeding is the first day of the count) and assume you conceive at about day 14, 15 or 16, by that count.  Even ultrasounds use this kind of count.  An ultrasonographer who says "You look to be 10 weeks 3 days pregnant" is saying you're about 8 weeks 3 days since conception.