I had my menstruation the 26th of august and got it back the 12 of September 2012 and ended the 15 to the 16th but only when I wipe, it didn't dirty my underwear, maybe only the 1st day. I have a 24 day cycle, but my mentruation was suppose to have came the 19th of september but didn't. I took a blood test the 19th it came out negative, so did the urine test the 20th. I'm having a lot of breast and back ache diarhea. Did I test too soon or am I not pregnant.