im worried i may be pregnant,i have had a lot of symptoms but test was negative, ive been to the hospital last week, they did not find anything wrong,i was due on today, but did not come on. im never late and have a 28 day cycle.i have already had two children so i know the symptoms,and with both of them i had early symptoms too. im 23 and have had a large amount of unprotected sex with my boyfriend this month, is it possible i may be pregnant? the hospital did find a tiny amount of blood in my urine last week and ive had a bad stomach ache/cramps. i never get pms cramps. im confused?