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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.
During the follicular phase, an egg follicle on an ovary gets ready to release an egg. Usually, one egg is released each cycle. This process can be short or long and plays the biggest role in how long your cycle is. At the same time, the uterus starts growing a new endometrium to prepare for pregnancy. The last 5 days of the follicular phase, plus ovulation day, are your fertile window.