ph balance

so me and my boyfriend have been fucking. he’s my only body and i’m his only body. i’ve been taking birth control recently so he’s been finishing every time we do it who h is basically everyday. one morning i woke up and i just felt completely unbalanced. like my ph feels off. there is an odor as well as discharge and i was not experiencing this at all. does it mean his sperm is mixing in with my vaginal juices causes an off balance? please help i’m scared. i don’t want to think i caught anything or make any assumptions that he’s cheating. but legit one day to the next, woke up and when we fucked it smelt. and it never did before.