Vagina odor

A

So I'm 5 weeks pregnant and just as of today I noticed that down there had a really bad odor, very very little discharge, no itching or burning. I'm very prone to UTI's but I know this is not one of them. I'm sure it has to do with beginning of pregnancy because I've never had this odor before. Has it happened to anyone? One of my friends said her doctor said it had something to do with a women's ph level