Is it possible to find out at which moment or period of time you conceived?

Has anyone managed to do this accurately so that they know during which particular sex session they conceived? If not a particular day or session, maybe you could narrow it down to a particular week? I find it quite hot to be able to pin down when we made our child haha. I also find it hot to encourage my guy to plant his sperm in me to make our baby during sex, which is possibly an impregnation fetish. Does anyone feel the same way?