Hi Miss Susan. I had protected sex on 9 august and then took postinor 2 both tablesta on 13 august. I had normal period but only lasted 3 days from 27 august to 30 august. Then I had protected sex again on 4 september so I took both tablets of postinor 2 on 5 september. It is 9 september and i am on my period. Is this normal? Please help.