I took two home pregnancy tests one straight after the other. first one was positive, second was negative. id be 4 weeks. am i pregnant?

Maybe: There is some variation in the manufacturing process of test strips that makes some strips more sensitive than others. The level of pregnancy hormone in your urine must reach a certain level to turn the urine test positive consistently. In a normal pregnancy, the hormone levels increase by at least 50% in 48 hours. You can wait 48 hours and test again or see your gyn and get a blood test.