TMI TMI TMI

So I had a question for all you women Out there. Me and my boyfriend have been together 8 months now and we just recently stopped using condoms. The first time we had sex I had a foul odor after ejaculation and I thought it could be BV or some kind of STD but I went to the doctor and everything came back negative. This has got me stumped because I've never dealt with this with any other person I've been with. Is anyone else out there going through the same?