Does the plan b day after pill work?

Yes, the Plan B (levonorgestrel) morning-after pill is effective in preventing pregnancy when taken within 72 hours after unprotected sex. It works primarily by delaying ovulation and may also prevent fertilization. However, its effectiveness decreases the longer you wait to take it, and it is not intended for regular contraceptive use. If you are already pregnant, Plan B will not terminate the pregnancy.