I have a fishy smell.

I have a fishy odor down there and have smelled my discharge it is not my discharge. It seeps through my clothes when I’m in class and I try to cover the smell. It gets bad. I shower 2 times a day and make sure to run water on my vagina to get rid of any discharge. I am going to see the gynecologist in 3-4 weeks but this is weird and it has never lasted this long. Any advice ? Could it just be an infection or is it an STD?