Unsure of date of conception. . Need to have piece of mind

[Lettyramonaibarra]

Okay so I had sex on 11/16/16 with a friend and then with my boyfriend a few different times through the week of Thanksgiving. . 11/24/16 -12/2/16 .
My last period is unknown  and I've had two ultrasounds so far and they both put my due date at 08/20/17 and my conception date at/around  11/27/16. I am aware conception date is usually not the day the sex occured. My question is it at all possible for my baby to be from the encounter I had on 11/16/16? I am just ready to put this lingering question behind me.

[AnnieBrooke]

Sperm does last in a woman's body a while, but no research I've seen says it lasts 11 days.  If your ultrasounds were early in your pregnancy, it doesn't sound like you got pregnant from the sex on the 16th.

You said "conception date is usually not the day the sex occurred."  While it is true that it can happen a few days later than the unprotected sex, it is also perfectly normal for it to be right on the day of the sex.  Just all depends on where your egg is at the time.