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Contrary to what you may have learned in middle school biology class, women can only get pregnant for a few days each cycle. This time, often referred to as “the Fertile Window”, typically lasts about 6 days. 6 days out of an average 28-day cycle! That’s means a woman is fertile for only about 20% of the time each cycle.
Having intercourse during the fertile window is, of course, critical when it comes to getting pregnant. After all, it’s impossible to get pregnant if the egg and sperm don’t even have a chance to meet.
But how can a woman find out when she is fertile? Enter ovulation tests, which are also known as ovulation kits, ovulation predictor tests, ovulation strips or OPKs. Ovulation tests work by measuring a hormone called luteinizing hormone – or LH for short. The LH spike causes the mature follicle to rupture, indicating that ovulation will occur imminently. Most women ovulate within 24-36 hours of a positive ovulation test.
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