Early pregnancy testing time Early pregnancy is a particularly sensitive period, and testing time is critical. In the early stages of pregnancy, it is best to test one week after a missed period, when hormone levels in the body will reach their peak and the accuracy of the test results will be relatively high. If tested early, false negatives may occur and need to be tested again. Precautions Before taking a pre-pregnancy test, you need to avoid any factors that may cause errors. For example, drinking too much water can cause false negative test results