Nasty smell? Tmi

I'm 15 weeks exactly today, and for the past few weeks I've noticed an unusual really gross smell when I change my underwear. My doctor tested me for any kind of infections and everything came back negative. She said my ph level is also normal. I shower every single day sometimes even twice. I can't get rid of it!!!! It makes me feel so self conscious, and I hate it, I don't know what else to do!! I've tried vagisil, I use summers eve wipes, summers eve deodorants  and the smell still doesn't go away:( sometimes the smell is like expired soup, and sometimes it smells like ammonia hair dye. I have no idea what's going on, I've never had this issue until I got pregnant. Anyone else going through this? What else can I do?? :(