How do you know if the plan b worked?

• Because emergency contraceptive prevents or delays ovulation, it’s normal for your period to be late.
• You might have irregular bleeding or spotting for up to a month after using Plan B, but it should go away by itself.
• Plan B doesn’t protect you from getting pregnant if you have unprotected sex later during the same menstrual cycle.

How bad is Plan B? Short answer. Plan B is safe for most. Only in rare cases – in which a person may be allergic, hypersensitive, or have overdosed – is the pill harmful. Plan B should also be used only in emergency situations, as it is not a form of birth control.

How long can you wait before you take Plan B? The manufacturer’s label states that Plan B One Step should be taken within 72 hours after having unprotected sex.

How reliable is Plan B? 1 doctor agreed: Very: Plan b taken within 1 hours is going to have an effectiveness rate of around 80-85%. That is if a woman were ovulating at that time, she would have 80-85% chance of preventing pregnancy.

How long does it take for Plan B to work? Plan B One-Step and generic levonorgestrel work best if you take them within 3 days after sex, but they may work up to 5 days after sex. Ella and the IUD can work up to 5 days after sex. However, those are only averages.