After implantation cramps, it is generally recommended to wait at least 3 to 4 days before taking a pregnancy test for more reliable results. Implantation usually happens about 6 to 12 days after ovulation, and it takes time for the body to produce enough hCG hormone to be detected by a pregnancy test. Testing too early may result in a false negative even if you are pregnant. For most accurate results, waiting until after a missed period is ideal, but sensitive early detection tests might provide an answer slightly sooner with a small chance of false negatives.