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The selected follicle grows to be about 20 mm in diameter, or about the size of a large grape. This process takes about two weeks and culminates in ovulation. The body triggers ovulation by releasing a hormone called luteinizing hormone, or LH. This hormone is readily measured in the urine some 12 to 24 hours prior to the release of the egg. Commercially available ovulation detection kits are based on the measurement of LH.
The follicular phase is when you are waiting to ovulate and can take as little as 7 days or as long as 30 or 40 days. At the beginning of your cycle, the lining of your uterus is nice and thin. If the egg released during your previous cycle is not fertilized, your estrogen and progesterone levels will begin to drop.