
If you really need the best plan emergent contraception, you should get a copper IUD inserted within 5 days of the intercourse. It is the most effective emergent contraception with a 99.9% efficacy rate by recent studies. Plan B’s efficacy ranges between 60-94 in recent studies, and is largely ineffective during ovulation. Longterm progesterone IUD is phenomenal contraception and reduces period pain, if non-emergent. Barrier is needed for reduced risk of STDs.