I am 22 years old and never used the pill before.

My boyfriend and I have a sexual relationship, and I don’t know if it is from intercourse or hormones, but almost every time a day or so after we had sex, I have a very bad smell (down there), and every now and then, even though we didn’t have sex.
That’s why I started to think that maybe it’s a hormonic thing. I bath 2 times a day, so that can’t be the reason. Is there any ‘pill’ you can recommend to use for something like that? Or any suggestions? Please help!!