Unsure of conception

[Kittenkween]

I’m unsure of my ovulation times and I was wondering if it’s possible to conceive during intercourse and then be nauseous from it 3 days after that.

It's highly unlikely. Even if you had your ovulation that exact date, implantation doesn't happen befor 6 days after ovulation. And then you won't experience symptoms right away. Your being nauseous will 99% have nothing to do with intercourse 3 days earlier xx