Hormones or pH imbalance

Kenya

So the first time my man came inside of me it smelled really bad i mean both of us had showered and everything ... but when he came inside of me this really weird almost old egg smell appeared out of no where ... then came inside of me the next day and the smell wasnt there ... so if anyone here knows about vaginas was it our hormones trying to match up with each other or was my vaginas pH levels trying to compensate for his ejaculate and whatnot?

Also a month later he came inside of me again and the rotten smell wasnt there. So etc was that?