A pregnancy test can usually be taken around the time of your expected period or a few days after a missed period. This is typically around 2-3 weeks after ovulation, which is when fertilization may have occurred. However, some pregnancy tests are more sensitive than others and may be able to detect the pregnancy hormone, human chorionic gonadotropin (hCG), in your urine earlier than this. It's best to check the instructions on the specific pregnancy test you plan to use, as they may have different recommendations for when to take the test. If you're unsure about when to take a pregnancy test, it's also a good idea to consult with your healthcare provider.