How many days are needed to get an accurate result in a pregnancy test (comertial)? (sorry if i said it wrong, my english isn't that good) thanx

After missed period: A blood test may be positive as soon as one day after a missed period. Home pregnancy test may be positive one day after a missed period, but a negative result at that time does not rule out pregnancy. It is better to do the home test 4-5 after a missed period, use first morning urine and follow the instructions in the package carefully.