What is it

Okay, so the past couple months whenever I go to the bathroom, to pee, I can smell a fishy smell from my vagina. It seems to go away and not be so bad but comes back up pretty strong when my period is close. I don’t have any other symptoms and I keep very clean. It seems to have been happening since my husband started to cum in me. It’s not an STD because ive has UTIs before and gotten checked for everything. Plus my husband doesn’t cheat.. but does Anyone else ever have this happen? if so, what was it? I’m going to be going to a doctor next week just to make sure everything is okay but figured I would see if any others had this experience.

Thank you.