I would like to ask you that if a girl is about to have her periods and she has a doubt that she is getting pregnant also, so if she can take a tablets of Emergency Contraceptive Pills(ECP) before 72 hours, then will it affect on her periods which she is expecting anytime?

Actually, we did not intercouse in such a way that ejaculation occurred inside, I even didn't insert but yes rubbed over the vagina so we have doubt that may be . May be . Male sperm penetrate inside.

Please advise at your earliest that if she can take the tablet now so will it delay/stop/miss her periods?