Postinor One (morning after pill) is a single dose oral emergency contraceptive pill. This also should be taken within 72 hours of unprotected sexual intercourse. This regime allows you to take only 1 pill which is more hassle free than taking 2 pills. If taken early the effectiveness is definitely more. Does not cause an abortion and should not be used as a regular contraceptive method.
Most of the time your period will occur on the usual day. Sometimes it may be earlier or a few days late. If your period is delayed for over 10 days consult your doctor and perform a pregnancy test because ECP is not 100% effective (as all other methods).
Progesterone only Pill (Postinor 1 & 2) Combined Oral Contraceptive Pill
ECP is not effective if several acts of intercourse have occurred in a row, at the same time?
NO. ECP is equally effective after one or several acts of intercourse in a row provided that all the acts have taken place within 72 hours preceding the intake of the drug.
ECP will act as an efficient contraceptive method until the next menstrual period?
NO. So it is strongly recommended to use a barrier method at each intercourse until the next period and start using a regular suitable contraceptive method from then onwards.