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Postinor is a emergency contraceptive pill
and is supposed to be taken with in 72 hours of unprotected sex.
Normally you get a withdrawal bleeding with in a week.
It is not advisable to repeat this pill with in a weeks time as it causes hormonal
imbalance and disturbs periods.
If you are getting reddish discharge then it is probably a sign of withdrawal bleeding you may get in a day or two.
is due to infection and not due to pill.
In future it will be advisable for you to take a regular contraceptive pill(a daily pill) if you are sexually active.
The benefit of using a regular pill is that it will give you effective contraception
as well as keep your periods regular.