TMI: What do you do after sex?

Mary
Trying to conceive our first. I have PCOS and I'm finally on the right vitamin/supplement regimen so that I'm having periods naturally. Tracking ovalution on Glow but not using OPK's. I've read different things on what to do after sex. I usually get up afterwards instead of propping my legs up. I've had friends tell me that you don't have to prop your legs up because the 'stuff' that comes out is semen not sperm. What do you do and did it help you conceive?