Hi, I have irregular menstruation, We are expecting our second child. I never had any birth control pills. We had unprotected sex. My last menstruation was 18th july 2O11. I have a feeling like I'm pregnant, My stomach feel full and time to time cramp. But until today [18th August] my urine test is negative. some mornings I feel Nausea. I'm confusing. Am I pregnant? How and when I needs to check exactly? please help me.