When does the period come after taking Unwanted 72 / I-pill?

I-pill and Unwanted 72 are both emergency contraceptives, taken to avoid unwanted pregnancy. 

Unwanted pregnancy can happen for various reasons, such as having unprotected sex, contraceptives not working properly, or due to sexual assault. Emergency contraceptives are the safest and most effective way to prevent unwanted pregnancy, with an effectiveness rate of 95-97%. Both I-pill and Unwanted 72 contain 1.5 mg of levonorgestrel, which is a synthetic form of the female hormone “progesterone.” I-pill prevents pregnancy in three ways: 

1. It delays ovulation, meaning it delays or stops the release of eggs from the ovary.

 2.It thickens the lining of the uterus so that a fertilized egg cannot implant. 3.It thickens the mucus in the cervix, slowing down the movement of sperm and preventing it from fertilizing any eggs. Now let's talk about how many days after taking I-pill or Unwanted 72, your period will come.

 For this, you need to divide your menstruation cycle into two halves from Day 1 to Day 28. Here, day one will be the first day of your period, not the first day of the month. So, if you take the I-pill within the first 15 days of your period, your period can come within 5-7 days. In the first 15 days, estrogen levels are high, meaning the eggs are getting ready for ovulation, which the progesterone in the I-pill prevents from ovulating or meeting the sperm. During this time, your period might be lighter than usual, or you might experience light spotting. 

And if you take the I-pill in the last 15 days of your period, your period might be delayed because during those days, progesterone levels are high, and since the I-pill also contains progesterone, the period gets delayed. In this case, the bleeding might be heavier than normal. Normally, periods come within 3 weeks of taking the I-pill or Unwanted 72.

Source:- 1.Gainer, E., Kenfack, B., Mboudou, E., Doh, A. S., & Bouyer, J. (2006). Menstrual bleeding patterns following levonorgestrel emergency contraception. Contraception, 74(2), 118–124. https://doi.org/10.1016/j.contracepti...