after me n my boyfriend have sex n he cums in me, like the next day i get this really gloopy clearish discharge. could that be because i'm on the pill or something else?

It’s probably his remaining ejaculate eventually trickling its way out of you. The pill is an unlikely culprit unless you get the discharge everyday you’re taking it and even when you’re not having sex.

If it bothers you, use a condom. Those lovely latex inventions keep the semen in one place until disposal. You also don’t have to wash your sheets as often because there’s less chance of them getting crusty from dried sperm. I’m all for delaying house chores.