I am 32 days late and have missed 2 periods now i had a blood test day 3 days late after my first missed period but was negative could i be pregnant?

Tests are accurate: A pregnancy test gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. In this type of case, one can repeat a pregnancy test. A home urine test should be very accurate by now.