Does anyone else experience yeast infections/BV after their partners ejaculate inside of them? Idk if it’s just in my mind but it seems like everytime my partner finishes in my I experience some form of yeast. And I really can’t imagine something like that is normal. Because what will happen when we’re trying to have kids.

Semen can throw off your ph down there allowing for infections to occur. Otherwise he might be also passing it to you, yeast infections in men are usually asymptomatic. He should get tested and treat it if that's the case. Otherwise, neither of you should use scented soaps to clean your privates, ideally only water or very mild and unscented soap.

Yes that's actually common

It has me feeling so insecure and conscious about it because i feel like people around me can smell it

Both of you should get tested and treated for it before having sex again as to stop from passing it back and forth. See if that stops it. As well as having him not finish in you, as that will prevent them hopefully.