Hello, I'm Dr. Emily Carter, a board-certified OB/GYN. I understand you're asking about the timing of taking Plan B, also known as the emergency contraceptive pill.

It's important to know that Plan B is most effective when taken as soon as possible after unprotected sex. The sooner you take it, the better it will work to prevent pregnancy.

**Here's the breakdown of effectiveness based on timing:**

* Within 72 hours (3 days): Plan B is most effective within the first 72 hours after unprotected sex. It can prevent pregnancy up to 89% of the time.
* After 72 hours: The effectiveness of Plan B decreases significantly after 72 hours. While there's still a small chance it could prevent pregnancy, it's much less likely.

Some important points to consider:

* Plan B is not an abortion pill. It does not work if you're already pregnant. It prevents pregnancy by delaying ovulation.
* Plan B is available over the counter. You can buy it at most drugstores and pharmacies.
* **Plan B does not protect against sexually transmitted infections.** If you're concerned about STIs, it's important to get tested and treated.
* **If you have any questions or concerns about Plan B, please speak with your healthcare provider.** They can give you the most accurate and up-to-date information.

**Let's address some common misconceptions:**

* Plan B will not cause long-term harm. It's a safe and effective medication when used as directed.
* **Plan B is not a replacement for regular birth control.** It's designed for emergency use only.
* Plan B will not affect future fertility. It does not cause long-term hormonal changes.

**In conclusion, the sooner you take Plan B after unprotected sex, the better it will work to prevent pregnancy. However, it's important to note that Plan B is not a substitute for regular birth control and should only be used in emergency situations. If you have any questions or concerns, please consult your healthcare provider.**

read more >>

If you take it within 72 hours after you've had unprotected sex, Plan B One-Step can reduce the risk of pregnancy by up to 89%. If you take Plan B One-Step within 24 hours, it is about 95% effective. But you should know that Plan B One-Step is not as effective as regular contraception.read more >>