How many of you know the exact day of conception?

I know it's not possible for anyone to know 100%, as you could ovulate late or early. The first month I tracked my period and when I assumed I would be ovulating, we had sex ONCE the entire month (it was a slow month for us, don't judge ;P) but that one time resulted in a pregnancy! Totally different than with my daughter, because I wasn't expecting her, I didn't find out til a little later. But with this one I know what day it happened, around what time, we were watching x-files, and it happened haha! Is anyone else in a similar situation where you know exactly when it happened?