(TMI) vaginal odor, need help!

OK so this is embarrasing but i need any advice i can get. I'm 27 weeks and I have been having odor the entire pregnancy my panties get this dark color during the day and damp so I try and wear panty liners, it's a smell that's always there almost like a fishy smell, Noone ever noticed it but I do. I have no infections or stds no abnormal discharge. I asked my doctor at one point and he said it was hormonal and should go away, but it hasn't I'm just wondering if anyone else has had this problem during pregnancy and will it go away after the baby comes. What can I do if anything about it?