Emergency contraceptive pills are not as effective as regular hormonal contraception, at the best of times.
There are 2 emergency contraceptive pills. One is Levonorgestrel (or Plan B), & the other is Ulipristal Acetate (or Ella).
Plan B is the one that is most commonly given. It works by delaying ovulation (release of an egg) until the sperm has left the woman's body (up to 7 days max). However, if you are already in your fertile time of the month (which, if she has a regular cycle, tends to be somewhere around days 7 to 18 in her cycle), Plan B is not the right choice of ECP, as it may not be able to delay your ovulation. In that case you need to use Ulipristal Acetate, or have an IUD fitted by a doctor.
Day 1 of your menstrual cycle is the 1st day of your period. You can work out where you were in your cycle, from there.
Levonorgestrel (Plan B) can be effective if used up to 72 hours (3 days exactly) after the unprotected sex, but is more likely to work the sooner you take it.
Ulipristal Acetate (Ella) can be effective if used up to 120 hours (5 days exactly) after the unprotected sex, but is more likely to work the sooner you take it.
IUDs can be effective as emergency contraception, if fitted within 120 hours (5 days exactly) of the unprotected sex.
Sometimes you get side effects from using emergency contraceptive pills, & sometimes you don't. It does not tell you anything as to whether the pill has done its job, or not, & you should do a pregnancy test at the time when your period would have been due, even if it comes on time. You can still be pregnant despite bleeding after using the ECP.
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