My period is late by 9 days which is unusual. I'm always on time for my period which is due either on the 9th or 10th. I have taken about 10 hpt but they have all come back negative.. I had intercourse a few days after my ovulation period. I have also been to the emergency room a few days ago because I have been really sick and in pain, and they have done blood tests but it has not come up that I am pregnant. Any ideas on what it could be?