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https://www.webmd.com/sex/birth-control/how-emergency-contraception-works#:~:text=Yes%2C%20it%27s%20often%20called%20the%20%22morning%20after%22%20pill.,are%20several%20kinds%20of%20pills%2C%20or%20an%20IUD.
https://pubmed.ncbi.nlm.nih.gov/11262449/
However, if the usual time limit (<72 hours) has expired, the so-called "morning-after" pill should be recommended if an intrauterine contraceptive device is not available. Emergency contraceptive pills have a favorable success rate after 72 hours, with a pregnancy rate that is significantly lower than would be expected if no contraceptive were administered.
https://walrus.com/questions/does-the-morning-after-pill-work-after-72-hours
The 'Morning After Pill', also known as an emergency contraceptive pill, contains a high dose of the progestin levonorgestrel. It may still work if you take it more than 72 hours after unprotected sex, but is not nearly as effective in preventing unplanned pregnancy as compared to taking it within 72 hours. Within 24 hours, it is nearly 95% effective.
https://www.womenshealth.gov/a-z-topics/emergency-contraception
If you are unable to take it right away, emergency contraception can still work to prevent pregnancy if taken up to three to five days after unprotected sex. How long after depends on which type of emergency contraception you use. Take Plan B One-Step® or a generic version as soon as possible within three days (or 72 hours) after unprotected sex.
https://www.plannedparenthood.org/learn/morning-after-pill-emergency-contraception/which-kind-emergency-contraception-should-i-use
These types of morning-after pills work best when you take them within 72 hours (3 days) after unprotected sex, but you can take them up to five days after. The sooner you take them, the better they work. If you weigh 155 pounds or more, levonorgestrel morning-after pills may not work. You can use emergency contraception to prevent pregnancy if:
https://www.enteromedics.com/can-i-take-birth-control-pills-72-hours-after/
The emergency contraceptive pill (ECP) is a pill that can be taken up to 120 hours (5 days) after unprotected sex, often referred to as the morning-after pill. When taken within 72 hours (3 days) after sexual activity, some types of emergency contraception work best.
https://www.nhsinform.scot/healthy-living/contraception/emergencies/emergency-contraception
There are 2 kinds of emergency contraceptive pill. Levonelle has to be taken within 72 hours (3 days) of sex. ellaOne has to be taken within 120 hours (5 days) of sex. Both pills work by preventing or delaying ovulation (release of an egg). Emergency contraception is best taken as soon as possible to be effective.
https://www.enteromedics.com/when-can-i-take-emergency-contraceptive-pills/
The emergency contraceptive pill (ECP) is a pill that can be taken up to 120 hours (5 days) after unprotected sex, often referred to as the morning-after pill. When taken within 72 hours (3 days) after sexual activity, some types of emergency contraception work best.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2792671/
The first dose must be taken within 72 hours (three days) after unprotected sex (it could be five days according to your doctor’s prescription). The sooner you take the ECP, the better it will work. If you throw up within 1 hour of taking the pills, you need to take another dose.
https://www.cdc.gov/reproductivehealth/contraception/mmwr/spr/emergency.html
Timing. Cu-IUD. The Cu-IUD can be inserted within 5 days of the first act of unprotected sexual intercourse as an emergency contraceptive. In addition, when the day of ovulation can be estimated, the Cu-IUD can be inserted beyond 5 days after sexual intercourse, as long as insertion does not occur >5 days after ovulation.
https://www.self.com/story/emergency-contraception-mistakes
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