There are a few at-home fertility tests that can help you determine your fertility. One is the basal body temperature (BBT) test, which involves taking your temperature every morning before getting out of bed. A rise in BBT indicates ovulation. Another test is the OPK (ovulation predictor kit), which measures the level of luteinizing hormone (LH) in your urine. A rise in LH indicates ovulation. Speak to your doctor for more information about these tests.