Fishy smell but no pain or irritatio

This is so gross but today I could smell something for a good portion of the day and when I got home I took my pants off and smelled them and my underwear too and they smelled terrible. Like so fishy and gross and I’ve had yeast infections before and smelling my underwear then has never bothered me much but this was actually gross. I know it is not an sti because I am in a committed long distance relationship but i have never smelled this before. Also weirdly, nothing else is wrong. I am not itchy or in pain. Not surwwhats u. Also discharge is kind of creamy