Vaginal Problem ! Help !😩🔫

Okay so I start my period tomorrow , and im 14 and when I was sitting down today there was a odor and I thought it was just someone else being stinky... But I noticed it followed me around until i got to my 4 hour class.. I bent down a little and noticed this was my vagina ?!! It sorta smelt kinda fishy ( sorry tmi..) How can I prevent this ?! I literally smelt it through my pants!