My last period was on the 16th of april..i av d 28day cycle and it sometimes add 7days(evry third month). I and my boyfriend tried having havin sex..on d 28th of apri,around 10pm..it was too painful for me..cos i was dry(i felt)so we stopd.@about 5pm d next day(29th) i took 2tablets of postinor1. On may7..i startd to bleed..it was brown/red(light) den later got very red like a period! Lasted about 5days(normal days for my period) den it stoped..i ovulated..the mucus were jux d rite ones..but now..i havnt seen my period(its june alredi) i av done lots of pregnancy home test..says negative! Am scared! Pls help..help me understand.