Family Planning Plus

It was not clear from your question what type of pill you took. If you took Plan B or the morning after pill, then yes, it will reduce your risk of pregnancy and you took it at an opportune time that will increase its effectiveness. If you are on regular birth control pills, if you have been taking them at the same time everyday, and if it has been over a week since you started taking the pill, then yes, it is effective. The timing between sexual intercourse and when you take your birth control pill does not matter. You just need to take it at the same time everyday so you’re getting a continual steady dose of hormones. If it was just one lone regular birth control pill and you did not take any other pills prior to that one, then no, it is not effective.