My last last menstrual period was March 22 2015. I had unprotected sex March 29 withdrawal method. Then I had sex April 3. We used a condom. the first time worked because i checked if the sperm seeped out of the condom and it didnt. but the second time we did it the condom slipped halfway and he pulled out. He did not ejaculate and he peed after the first time. After 48 hours I took an ECP (Nordette) 4 pills in the afternoon and 4 pills after 12 hours. I did expereince hedaches and dizziness after taking it and breast tenderness. I also felt Mittelshmerz April 6. Its been 5 days and still no withdrawal bleeding and Im feeling a little cramping. I took a preg test just now and it came out negative. Very confused now please help. I have a 28 to 31 day cycle and Im very regular its like clockwork really.