When should you take your pregnancy test? Is your negative test a false negative? Testing for pregnancy when trying to conceive is a sensitive issue. The emotional toll of repeated negative results is hard to imagine for those who have not experienced it. At the same time, waiting throughout the luteal phase to know the outcome of your cycle can be agony. For these reasons, knowing when to expect reliable results is extremely important, both to preserve your emotional state and to save money by not testing too early.