Hello, thanks for using health care magic
Unwanted 72 is a progesterone
pill whose effectiveness has been demonstrated to be very high if taken within the recommended time period of 72 hours after intercourse. So if you were not initially pregnant, it is very very likely that you will not fall pregnant again. It would have been helpful had it been you described your last menses if it was normal as usual, or reduced or abundant. If the menses was normal then you do not have to worry about getting pregnant but if on the contrary it was abnormal, you should do a home pregnancy
to rule out any pre-existing pregnancy.
contraceptives generally might cause slight modifications in hormone equilibrium in the body which could account for the bleeding you experienced. Also, this disequilibrium could account for modifications of menstrual cycle causing bleeding to occur days before or after the expected date of menses.
Best regards and hope this helps.
Dr. Achuo A. M.