You can get Plan B from any pharmacy without a prescription or proof of age. It’s best to keep Plan B on hand if you’re sexually active and don’t want to become pregnant. However, you can pick it up anytime you need it.

If you have any questions, ask your pharmacist or call your doctor for advice.

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.

Plan B doesn’t reduce your chance of catching a sexually transmitted infection (STI). After 5 days, you can use any form of birth control.

Call your doctor as soon as possible to increase the effectiveness of the morning-after pill of your choice.

They may ask you to come in for an appointment, but it’s possible that your doctor will advise you over the phone. They might prescribe you a different emergency contraceptive or advise you to take a second pill.

Don’t drive if you’re still tipsy or high. Ask someone to drive you to a pharmacy or pick up Plan B for you.

Don’t worry if you have nausea right after you take Plan B. This could be a side effect of the medication. It takes several days for an egg to be fertilized and implanted, so try not to worry. [10] X Research source

Like with nausea, you might have swollen, painful breasts for a few days after you use Plan B because it’s a possible side effect. This doesn’t mean you’re pregnant. [12] X Research source

If you’re feeling really stressed about potentially being pregnant, it’s possible that this is causing your fatigue. You may be having trouble sleeping or could be feeling overwhelmed. Don’t assume that you’re pregnant until you’ve taken a test.

Check with your doctor if you’re concerned about your mood swings.

You can start taking pregnancy tests as early as the expected first day of your next period. However, you don’t need to worry until your period is at least a week late.