TMI question body smell

So I have been having this smell down below it's like a mildew/fish smell I'm very good about washing up and cleaning my body but the smell will return through the day I don't have any burning or nasty looking discharge my discharge has been clear watery or sometimes white, I asked my Nurse about this cause it only started when I got pregnant and they said when you get preganat and all the body changes but I didn't have this happen before so I'm kind of worried I had BV before and I'm wondering if that's what it is again maybe my PHbalance is off has anyone else had this happen?!?!?