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You were born with almost half a million eggs, most of which will only serve as nourishment to those that ripen. Usually, only one egg ripens and
is able to be fertilized every month. (The egg is also known as the oocyte, ovum and gamete.) Ovulation occurs typically two weeks before each period, not simply at mid-point
in your cycle. (The 280 day pregnancy is based on a 28 day cycle.) Ovulation is triggered by the "LH Surge" - the sudden rise of luteinizing hormone (LH) that occurs
mid-cycle. On the surge day, blood levels of LH rise to between 25-40 mlU/ml, up from 5 - 20 mlU/ml on day three of your cycle.
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