How soon can I request a blood test for pregnancy? I miscarried in november and am eager to know asap if I am pregnant again.

A day after missed. Peroid. A blood test may be positive as soon as a day after a missed period. A negtive test that early would not rule out pregnancy. It would be better to wait 4-5 days after missed period to do home test; using first morning urine and following the instructions in the package carefully.