Peeing after sex when TTC????? ?

Are you supposed to wait? My main concern is on the sperm. Not necessarily about UTIs because I already know you could get one from not peeing right after sex. I personally have never ever had a UTI so I wouldn't know first hand. But my main question is should you wait to pee? Does it matter? Does pee kill perm? If u pee does it wash away all the spermies trying to make their way? Does it not matter at all? Is it just a myth???   I'm sorry if this is weird I just don't know the right answer! Thank you. HELP!!!!