I am 12 days late. I did 3 home pregnancy tests 2 days ago, all were negative. I had intercourse 4 days before the due ovulation date. We used a condom, plus I took an iPill the next day. My periods are regular. During the ovulation period I had a pimple or two (which never happens!) and I also had the regular cramps when the period was due. But I never bled. I am 12 days late now, but don't have any other symptom of pregnancy either. My breasts aren't sore, and I don't feel nausea. What do I do? What could be the cause?