Question: how long can the morning after pill affect you?
Answer: The emergency contraceptive Pill (ECP) is also known as the morning-after pill, but it's not just for the morning after. ECPs are most effective when taken soon after unprotected sex, but can still have some effect for up to 4-5 days (96-120 hours) depending on where you are in your cycle and which pill(s) you take.