How Long Does Plan B Delay Your Period?

Plan B can delay your period by up to 7 days, though most women experience their next period within 3 weeks of taking it. The levonorgestrel in Plan B disrupts your normal ovulation cycle, which can shift your menstrual timing. About 13% of women experience a delay of more than 7 days, while others may start their period earlier than expected. The delay depends on when you took Plan B during your cycle - taking it closer to ovulation typically causes more significant timing changes. If your period is more than a week late after taking Plan B, consider taking a pregnancy test to rule out pregnancy.