So my girlfriend has not had a period since April. She tried 5 different pregnancy tests since at different times and all of them confirms theres no pregnancy. She went to her doctor and he did a urine and blood test to verify and again was told that those tests proved negative. She is getting a sonigram tommorrow to confirm as well a pregnancy or tell her if her missed period is caused by something else. My question is, does a blood and urine test 100% confrim no pregnancy or is there still possible doubt until a songram is done? and if it's not due to pregnancy what are the potential reasons?View Thread