How soon should you take Plan N?

Asked by: Reid Renner  |  Last update: July 24, 2025
Score: 4.7/5 (63 votes)

You should take the emergency contraception pill as soon as possible; up to 120 hours (5 days) after unprotected sex. Emergency contraception pills are free to all Yale students and Yale Health members when acquired at the Yale Health Center.

How effective is Plan B immediately after?

The data and studies are mixed on exactly how effective each one is: The levonorgestrel option should be taken within the first 72 hours (three days) after unprotected sexual intercourse. Studies show it can be around 94% effective if you take it in the first 24 hours. It's about 58% effective within 72 hours.

Is it better to take Plan B sooner or later?

Plan B is used to help prevent pregnancy after sex and must be taken within 72-hours after unprotected sex or if your primary birth control failed. The sooner you take it, the better it will work. It is not meant to be used as a regular form of birth control because it is not as effective.

Can you get pregnant 3 days after taking the morning-after pill?

How Well Does Emergency Contraception Work to Prevent Pregnancy? About 1 or 2 in every 100 women who use ECPs will become pregnant despite taking the pills within 72 hours after having unprotected sex.

Will Plan B work if he came in me four times?

Does Plan B work if my partner came inside multiple times? The effectiveness of Plan B doesn't change if your partner has ejaculated in you multiple times. However, because Plan B delays ovulation, you want to be sure that the ejaculation is timed to keep you protected by the dose you took!

The Science of 'Plan B' - Emergency Contraception

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Is taking too many Plan B bad?

There is no known limit on the number of times you can safely use Plan B. Plan B can even be taken more than once in the same menstrual cycle. While research is limited, existing data suggest repeated, long-term use of Plan B has no known health risks and does not affect future fertility.

What are the odds of getting pregnant after taking Plan B?

Effectiveness. Emergency contraception pills reduce the risk of pregnancy by approximately 75%. In other words, out of 100 women who have unprotected intercourse mid-cycle, approximately 8 would become pregnant. With use of emergency contraception pills, only 2 of the 100 would become pregnant.

When are you most fertile?

Your fertile window is the five days leading up to ovulation, plus the day of ovulation and the day after ovulation — so about seven days in total. It's important to note that if you have irregular periods and the length of your menstrual cycle varies from month to month, the calendar method won't be accurate for you.

What causes the morning after pill to fail?

Some reasons Plan B might fail include: Ovulation: Plan B works primarily by delaying or preventing ovulation. If a person ovulates before taking it, they may still get pregnant. Weight: Some studies suggest that Plan B works less well in people with a body mass index (BMI) of over 30 .

What is the failure rate of Plan B?

Pregnancy rates following use of levonorgestrel ECPs in clinical trials range from 0.6% to 3.1%.

How to avoid pregnancy naturally after 1 week?

Home Remedies To Avoid Pregnancy After Unprotected Sex
  1. Papaya: Unripe papaya is beneficial in preventing the fertilisation of ovum. ...
  2. Cinnamon: Another element that is found beneficial in preventing pregnancy is cinnamon. ...
  3. Pineapple: ...
  4. Ginger: ...
  5. Vitamin C: ...
  6. Neem: ...
  7. Sesame seeds: ...
  8. Parsley:

Does bleeding after Plan B mean it worked?

After taking Plan B, your vaginal bleeding might be different than it was in previous cycles (20). You might experience bleeding or spotting before your period, but the only way to know Plan B worked for sure is to take a pregnancy test if you don't get your period within seven days of when you expected it (20).

Does cramping after Plan B mean it's working?

Cramping after Plan B does not necessarily mean it is working. Taking Plan B causes hormone fluctuations which can cause side effects. Lower abdominal cramps are one of the side effects of Plan B. However, you cannot rely on these side effects to tell if the emergency contraception worked.

What to drink to prevent pregnancy after a week?

Ginger: Consuming ginger in the form of tea is believed to have contraceptive properties as it can induce a period and prevent pregnancy naturally. To prepare ginger tea, you can add crushed or grated ginger to boiling water and let it steep for 5 minutes.

Can you be pregnant if you took Plan B and got your period?

Some irregular bleeding — also known as spotting — can happen after you take the morning-after pill. It's also normal for your period to be heavier or lighter, or earlier or later than usual after taking EC. But once you get your period after taking emergency contraception (EC), that's a sign that you're not pregnant.

How do I know I'm ovulating?

7 signs of ovulation
  • Cervical mucus. If you notice a thick, slippery mucus similar to an egg white in your underwear or when you go to the bathroom, the cervix is releasing mucus. ...
  • Increased libido. ...
  • Elevated basal body temperature. ...
  • Cervical position. ...
  • Tender breasts. ...
  • Ovulation pain. ...
  • Position ovulation test.

What is the best month to have a baby?

First, a look at the science – is there really a "best" month to get pregnant? The short answer is no, there's no "best" time to get pregnant. But the most popular time to conceive a baby in the U.S. is November 25 to December 2, per one study published in Human ReproductionOpens a new window.

When are you least likely to get pregnant?

As a result, there are around 21 days in the menstrual cycle on which pregnancy is less likely. The days before and during menstruation are the least fertile menstrual cycle days. People with a menstrual cycle that is shorter than 28 days could ovulate within days of their period ending.

What cancels out Plan B?

Plan B may interact with topiramate (Topamax), carbamazepine (Tegretol, Equetro), and St. John's wort. Efavirenz (Sustiva) and rifampin (Rifadin) can also interact with Plan B. Paragard (the copper IUD) can be an emergency contraception alternative if you take medications that interact with Plan B.

How long does it take for sperm to reach the egg?

A man may ejaculate 40 million to 150 million sperm, which start swimming upstream toward the fallopian tubes on their mission to fertilize an egg. Fast-swimming sperm can reach the egg in a half an hour, while others may take days. The sperm can live up to 48-72 hours.

How many days after taking the pill am I protected?

You will not be protected from pregnancy straight away and will need additional contraception until you have taken the pill for 7 days. If you start the pill after the 5th day of your cycle, make sure you have not put yourself at risk of pregnancy since your last period.

What to avoid after taking Plan B?

There are certain medications and herbal supplements that you should avoid after taking Plan B, as they may lower the efficacy of the drug. These include: Barbiturates (including primidone) Bosentan.

Can Plan B cause weight gain?

Plan B shouldn't cause weight gain or weight loss. Body weight changes weren't reported by people taking Plan B in its original clinical trials. In fact, most forms of birth control don't cause weight gain. It's possible to experience bloating when taking progestin-based birth control.

Should I take Plan B if he pulled out?

Plan for worst-case scenarios if you're using the pull-out method. Emergency contraception, like the morning-after pill, can prevent pregnancy if taken within five days of intercourse. It's a good idea to have some available if you're relying on the pull-out method.