I had protected sex on 20 Nov and took unwanted 72 after 12 hours. I got withdrawal bleeding for 3 days ( 26-28 nov). I took 4 pregnancy test and all were negetive ( took one on 21st dec which is one month after intercourse).The next period I got was on 7th January (40 days after my withdrawal bleeding) which lasted 4 days . Earlier my cycle used to last for 31-33 days but today it's 14 Feb ( 41st day ) and still no sign of period. Should I be worried about pregnancy. If not then when can I expect my next periods.