Exactly Ovulation test The exacto ovulation test detects the 2 most favorable days for conceiving a baby 99% reliability 10 Tests The Exacto Ovulation Test is a rapid self-test that detects the LH surge in your urine, indicating the likelihood of ovulation occurring in the next 24 to 36 hours. For a pregnancy to occur, the egg must be fertilized by a sperm within 24 hours of its release. It is important to note, however, that the LH surge and ovulation may sometimes be absent during your cycle. The Test, 99% reliable, therefore allows you to identify the 2 most favorable days for conceiving a child.