I wasn't planning to write a review but since they emailed me asking here we go. I think these tests are a waste of money and prey upon the vulnerabilities of women struggling to conceive. The positive/ negative result did not comport with blood tests and advice given by two different OBGYNs. The invented concept of "good or bad" ovulation is a misleading oversimplification at best and pseudoscience at worst. These tests are extremely expensive, hard to read, and have created panic in many women who ovulate completely normally and are able to achieve pregnancy.