Hi,
Yes, Postpone 72 is not 100 percent effective and it can cause a pregnancy in a few people.
You will get to know about its effectiveness only after your next periods,though you might have a withdrawal bleeding or you might not have it . Pregnancy can only be confirmed after your next normal periods.
If your next periods are normal with same flow and last for same number of days then you should be safe enough(confirmed) that you don't have a pregnancy.
There can be a pregnancy after even h ...
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