hello dr, one night before my period was suppose to start i had massive pain in my lower abdomen/pelvic region. I tried going for a bowel movement, but it did not help. Pain only last for 30-45 minutes. The next day my period was supposed to start, and it still has not, i am 8 days past my missed period. My last period was 18th of Aug, and I am on a regular cycle of an average of 28 days. The shortest cycle (last cycle of 26 days) and the longest ever being of 29 days. Now I am on CD 37. Negative HPT, more than usual headaches. My husband and I had intercourse on 7th or 8th of Sept, and according to what i remember I had ovulated either a several days back or just couple of days (can't exactly remember, just remember ovulating). Is there a chance my hcg level is too low for urine test to pick up, and maybe I actually am pregnant, and need a blood test done???? Or was it bc of that weird pain I experienced the night before my expected period that caused me to miss it??? (I normally never experience any sort of pain during my cycles). I am not under any stress, no diet change, no exercise. Is it possible to have a negative urine test and actually be pregnant?