I had unprotected sex. Following it up I took unwanted 72 within half an hour sex. After two days again I took the unwanted 72 pill. 3 days before my period was due I had a little bit bleeding which lasted for 3 days. It was not at all heavy like a period bleed. The colour of bleed was deep red and brown. Nor was there any cramps like I usually have. After it ended I took the pregnancy test it came out negative. I took the test again after 5 days and still it came negative. Am really worried. Its been a week I haven't got period and the tests are coming negative. What could this be?