In Jan n Feb 2017 i had reg cycles (they lasted 5days n reg every 28days). This SD; prd due in March (though it was on time to the day), it lasted under 24hrs. My OB had me do prego test which was neg. Thn repeat 7days later. Same result. Sexually active n soon to b 32yrs old at start of May. Cycle was due to take place 12th this month (April '17). Got it on 7th but ended 3days later on 10th. Should I b concerned by this?!/ Is this nothing to worry about?! Ne advice helpful.