Most people with regular 28-30day cycles ovulate between days 10-16, but usually day 14 for the majority. Start testing 10
days after the first day your last
menstrual cycle and test the same time each day. It's better not to use the first morning sample, unlike pregnancy tests. One you see the test is positive, you'll be ovulating within 24-48 hours, so those days are your best chances to conceive.