Family Planning Plus

No, it is highly unlikely she would be pregnant.

If she takes her birth control pills everyday (even though she may have been off by a few hours here or there), we would not have recommended Plan B. She is already getting a sufficient amount of hormones from her regular birth control pills to prevent pregnancy. Since she used Plan B, she can expect some menstrual irregularities due to the extra large dose of hormones. Her period may be early, late, or spotty (meaning she may bleed for a few days, stop for a day or so, and then bleed some more). She may even miss her next period if the hormones prevent her uterine lining from building up.

She should continue to take her regular birth control pills at the same time everyday (or at least within a three hour time period everyday). If she does miss her period, wait three weeks. If she doesn’t have any bleeding by that time, have her take a pregnancy test just to be sure.