How Long After Taking Plan B Can You Get Pregnant

Tiptop things to know:

• In the United States, there are two different types of emergency contraceptive pills: one is available over the counter, while the other needs a prescription

• I-dose emergency contraception pills preclude pregnancy about fifty-100% of the fourth dimension

• Some reasons emergency contraceptive pills can fail include ovulation timing, BMI and drug interactions

Near of the time, emergency contraception works, when it's taken within the recommended window post-obit unprotected sex.

There are ii types of commonly used emergency contraception: emergency contraceptive pills and the copper IUD (1). In this commodity, we are going to focus on emergency contraceptive pills, which are also called emergency birth control or morning time-after pills—we'll utilise these terms interchangeably. (If you're interested in learning more about the copper IUD, you can read nigh it hither. Additionally, in some cases, combined oral contraceptives ("the pill") can also be used as emergency nativity control).

The effectiveness of the forenoon-after pill can exist hard to written report, because it tin can be difficult to know if people are ovulating, when they had sex and what day they are on in their bicycle (2,3). Based on the data scientists take, one-dose emergency contraception pills are constructive at preventing pregnancy about 50-100% of the time (3,4). (The range varies widely because there are many components to fertility: people don't get pregnant every single fourth dimension they have unprotected sex, and at that place are lots of different factors which lead to conception.)

In that location are two types of pills used for emergency contraception (1), which we'll draw in more particular, beneath.

Progestin emergency contraception (besides known as levonorgestrel)

Bachelor over-the-counter

In the Us, the progestin-only emergency contraception pill can exist purchased in pharmacies past anyone of any age without a prescription (1). Y'all should take it as soon as you lot can subsequently unprotected sexual activity, but information technology's almost effective if taken within 72 hours (1). You lot can take it for up to five days after intercourse. If you take it between iii and 5 days, the charge per unit of effectiveness is reduced (1).

Information technology works past delaying the release of the egg from the ovary (ovulation), preventing the sperm  from fertilizing it (v).

Antiprogestin emergency contraception pill (also known as ulipristal acetate)

Available by prescription

Antiprogestin emergency contraception pills are the most effective grade of emergency contraceptive pill (ane) and available only by prescription. This pill should be taken as soon equally possible after unprotected sex (six), simply you can have it up to five days later (1).

This emergency contraception pill changes the manner progesterone works in your torso (1). It works by preventing or slowing ovulation (ane). When ovulation is postponed or halted, there is no egg for sperm to fertilize, and pregnancy is prevented.

Why does emergency birth command fail?

A person who takes emergency contraception tin still get pregnant. Hither are the three principal reasons why this happens.

1. You started ovulating before y'all took the pill

Emergency birth control is all about timing. It's recommended that you take the pill as soon every bit yous can—if you lot expect besides long, you might miss the window during which the pill can be effective.

If yous have it right afterwards sexual practice, it can foreclose y'all from ovulating if you haven't started already (1). If you have sex activity on at the time you ovulate or after you ovulate, your emergency contraception pill won't exist effective (seven).

If you take unprotected sex over again afterwards you accept the pill in the same cycle, information technology could besides fail (7).

2. The forenoon-after pill doesn't work equally well for your torso type

Healthcare providers use the Torso Mass Alphabetize (BMI) scale to grouping people into generic categories based on height and weight (viii).

Current studies show that emergency contraceptive pills are less effective for people who have a BMI of thirty or college (7,ix).

People who have a BMI of 30 or higher who take emergency contraception take pregnancy rates that are ii to 4 times higher than those with a BMI of 25 or less (7,ix). But more research is needed.

Antiprogesterone emergency contraceptive pills offer better prevention of pregnancy for those with a BMI of thirty and higher than progestin emergency contraceptive pills (vii), and a copper IUD may be the most effective method of emergency nascence control for those with a BMI of thirty or over (1,7).

Though the morning time-after pill working has lower efficacy rates for people with higher BMIs, information technology withal prevents pregnancies in this grouping. It's better to take it than not take information technology, in gild to foreclose pregnancy (9).

iii. You're taking a medication that interacts with emergency contraception

Drugs or herbal products tin can both crusade emergency birth command pills to be less constructive (6,x).

Accept note, these drugs and herbs should non be taken with emergency contraception pills (x,6):

• Barbiturates

• Bosentan

• Carbamazepine

• Felbamate

• Griseofulvin

• Oxcarbazepine

• Phenytoin

• Rifampin

• St. John's wort

• Topiramate

Be sure to double check the emergency contraceptive package data insert for more detailed information.

Hormonal birth control can also cause interactions with the antiprogestin emergency contraceptive pill. Nosotros'll talk more than about delayed use, beneath.

What to do after you take emergency birth command

Progestin emergency contraception (besides known as levonorgestrel)

Available over-the-counter

After you lot accept the progestin-but emergency contraception pill, use a barrier method like external or internal condoms or don't have sex for least seven days (1). You tin can continue or start taking hormonal birth control (like the pill, patch, shot, or ring), start straight away (1).

Antiprogestin emergency contraception pill (also known every bit ulipristal acetate)

Available by prescription

If you take the antiprogestin emergency contraceptive pill, use barrier methods or avoid having sex activity until your next period. If yous want to commencement (or continue) taking hormonal birth control, look until 5 days afterward taking the emergency contraceptive pill (one,eleven). (Hormonal birth command can cause the antiprogestin emergency contraceptive pill to be less effective if taken at the same time (1,xi)).

After following these precautions, you can get about living your life. You don't need any follow-upwards tests or procedures (1). Yous don't even need to tell your healthcare provider (unless you desire to) (1). If your period is over a week late, take a pregnancy test to be certain you lot aren't pregnant (1).

What happens if yous took emergency contraception and do become significant?

Emergency contraceptive pills won't harm the pregnancy or the fetus (1).

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Planning ahead

It might be a expert idea to stock up on an emergency contraceptive pill in example you need ane in the future. Y'all tin ask your healthcare provider for a "only-in-case" prescription or grab an over-the-counter pill from the pharmacy to go on at habitation.

Don't forget—the emergency contraceptive pill, like hormonal birth control, does non prevent sexually transmitted infections (STIs). If you remember you might be at risk for STIs, always employ a barrier method when yous accept sex activity and talk to your healthcare provider about getting an STI screening.

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Source: https://helloclue.com/articles/sex/why-the-emergency-contraception-pill-fails

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