Normally my periods are extremely regular, could practically set my calendar by them, every 28 days, lasting approximately 5 days each time. This month my period started on 5th March, ended on the 10th. I started bleeding heavily again yesterday like a proper period. Very heavy flow today also. Not on any contraception, recent smear/std negative (Sept 22), definitely not pregnant. Quite worried to what it might be. Any advice or similar experiences would be greatly appreciated