I got my period on dec52011 and I had sex on the 9 my period ended later that night.. I later on the16-19 had sex and my boyfriend ejulated in me through out that weekend. On feb 23 I went to get a ultrasound and tey said the baby measured at 9weeks and4 days and I'm due sept 10. I had another ultra sound April 6 and they said I was 16 weeks and still had the same due date.. When do you think I conceived?

Sound like you got pregnant after your December period.. they are pretty accurate

Most likely you conceived on December 19.

It is most likely the 16 and of course unless it was two different men it really makes no difference. But from the 9th to the 16 is merely a week and tests can not be 100 percent sure within that short time frame. So is there a reason for the concern of an exact date? Since within 7 days there si no way to be 100 percent sure.

Yea there were 2 different people that's why I ask. The guy from the9th was a bit older. And I heard sperm only stays alive for 3-5 days... And the doctor said I was ovulating on the 19th.

Was the doctor checking you around the 19tth or was that just a estimated time. Sorry you will have to get a DNA test to be 100 percent sure, there is no way to know when you have sex with in seven days of each other.

The doctor checked me on feb23 and she said the baby measured at 9weeks and 4 days which when you go back is around the 19. The guy from the 9th is pretty sure he can't grt anyone pregnant due to his age... And when I asked my doctor if she thinks I conceived on my period she said it wasn't likely.. And around my 1st month of pregnancy the guy from the 16-19 was feeling sick like me and wanted to be around me more etc

So the guy was about 90 years old ? Sorry men 50, 60 and some even into their 70's can and do have children.

And yes it is not "likely" that means there is also still a chance, And no being sick like you is not a real sign. Wishful thinking perhaps,

DNA test and be sure.