I had unprotected sex about 3 weeks ago.&3 days ago after the gym i had minor cramps when i went to the restroom i noticed pink light discharge. help!

See your doctor: It is not feasible to provide a meaningful opinion without examining you. You may be pregnant and you could do a home pregnancy test. You may have acquired an infection and that would require tests.

Take pregnancy test: Your light pink discharge may be early sign of upcoming menses. Or it may be implantation bleeding. So when you're 4wks late, go take home pregnancy test, available w/o prescription at most any pharmacy. If it's negative & you don't want to get pregnant, ask your doctor about some form of contraception. If it's negative & you want to get pregnant, keep trying. If positive, then start prenatal care.