Will taking plan b after 5 hours of sex prevent pregnancy?
Patient: How effective is plan b after ovulation . Note , I didn't ejaculate inside my partner , to be cautious we took plan b 5 hours later .  Her period is 4 days long and we had sex on the 3rd . She expects her period on the 8th. Should plan b prevent the chance of pregnancy . Doctor: Of course plan B helps in preventing pregnancy . Though she took plan B pills after her first act , she did not take it on the  3rd , however she would have done. But anyhow she was in the safe period. My advice is that that whenever there is an act of unprotected sex , please consult your doctor .There is  plan B step 1  which is being followed these days.`