Help!

I'm very worried about this.... So I've had only 2 sex partners my whole life and my ex says he's clean and that he hasn't been with anyone else and I believe him and the guy I'm with now is marine so he's been tested for everything and he's clean, BUT recently the discharge in my underwear smelt musty but it went away and now it kinda smells funny like a yeast infection but I'm not sure, I'm not itchy it doesn't burn... I've had discharge since I was like 15 I'm 19 now and I've always got checked out for it they say the discharge is normal every time, but now the smell is different I've never had it before and I'm kinda a hypochondriac lol so I might be freaking out for nothing, but if anyone has advice please help a sista out! 😁