I had my periods on 30th oct being very regular and observed brown discharge on around 13-16th day of cycle then I had sex on 20nov with condom in all except for once which we did pull out method. (Sex was very rough) I had fresh bleeding lasted only for a day and came out on tissue after wiping wasnt a flow like blood its 2 dec now and my periods are delayed for 2-3 days should I be worried?