Embarrassing question

I keep having days of weird smelling discharge, almost metallic smelling. I’m currently 15 week. It’s not fishy at all, it still looks like normal discharge (not colored/chunky etc) and no itching. I’ve read it could be hormones causing it or PH balance being a little off. I’m going to my doctor in 5 days. It will be off smelling for a day and then fine for 3 then on one day then off again. Idk if its my diet or what.

I read somewhere that synthetic material underwear may cause issues. So I want to go buy all brand new undies and see if this helps.

What’s your favorite kind of underwear during pregnancy? Has anyone had this issue too?