The PH levels have to get to a certain level where they will be picked up in the urine in order for a home pregnancy test to determine if you are pregnant.

Are Home Pregnancy Tests Always Accurate. You are more likely to get a false negative reading than a false positive reading when you are using a home test for pregnancy. Women who get a false negative reading often do not follow the directions for the test or take the test too soon. August 3 Leave a reply One question that women always ask themselves when using a home pregnancy test is if they are always accurate. In other tests, pregnancy can be determined a number of days after a missed period. Many women who get a false negative will take the test a few days after they have had intercourse to see if they are pregnant. In some tests, it takes a week after you have missed your period before this can be determined through the test.

A positive reading with a home pregnancy test almost always means that you are pregnant.