Question: things to do after unprotected sex?
Answer: Within 72 hours. Take the emergency contraceptive pill. The ECP (emergency contraceptive pill) can be taken up to 72 hours (3 days) after unprotected sex, but new research shows it's effective up to four days after sex. ... 
Or, within 5 days. Get an IUD. ... 
2 weeks later. Get an STI check.