Stanky fishy stanky fishy

So I’m 17 and have recently started wearing thongs. I made sure to get cotton and not lacy ones so that my coochie can breathe but I have noticed ever since I’ve started wearing them that there is more of a uh smell. A smell that I didn’t smell when I was wearing like normal brief cotton underwear. Also I think I’ve noticed more discharge when I wear thongs than when I wear regular underwear which is weird. Never done anything sexual with anyone or even myself so I am sure that I don’t have STDs or something. I don’t expect answers, I just wanted to know if anyone else has/had this problem.