These tests detect the luteinizing hormone (LH) surge that occurs just before ovulation, helping identify the best time to ...

Ovulation occurs around 10 to 12 hours after LH levels peak. This is known as the LH surge. Ovulation lasts for about a day (24 hours). However, you can get pregnant up to six days after ovulation ...

Day 14 Without the LH surge, ovulation doesn't occur and no ovum is released. The constant level of progestin makes the lining of the uterus inhospitable to implantation of an embryo. The cervical ...