⚠️BROWN DISCHARGE ⚠️ PLEASE HELP .

im 17 i don’t have no one to talk to about this . i’m sexually active with my boyfriend and having un protective sex . i got off my period weeks ago but i’m still constantly bleeding and sometimes it’s brown then clear discharge then it goes back to brown and it won’t stop , it’s been happening for weeks now . please somebody help me . what can this be ?