Can you take plan b on 4th day?

Plan B, or emergency contraception, is most effective when taken as soon as possible after unprotected intercourse, ideally within 72 hours. However, it can still be taken up to 5 days after the event, though its effectiveness decreases over time. Taking it on the fourth day is possible, but it may not be as effective as taking it sooner. Always consult a healthcare provider for personalized advice.