I have periods in average 28 to 30 days long. Last month my period lasted 36 days. This month i had un protected intercourse on days 10, 12, 13, 15 and 21st of the period. Today is day 28 and since probalby 3 days ago i had been having cramps , since problably about a week ago very sensitive breat (more painful last days) and yesterday night i thought i wuld start bleeding but today i only had a dark red spot. I have this feeling of start bleeding about any time , i feel kind of wet but when i chek it out there is nothing on the liner. Maybe just tiny brown spots on the toilete paper. What is happening? I forgot to tell that the doctor told me some months ago i had Poliquistic ovarian syndrome so it could ve difficult for me to get pregnant . Any idea?