If it is mostly regular, ovulation occurs two weeks after the first day of your last menstrual period. This is the best time to get pregnant (including a day or two before and after). If you are irregular, it is much more difficult to find out when ovulation occurs. A thermometer to measure temperature "down there" can help you figure out when this is. The concept is still the same - it may be anywhere from 10-18 days since the first day of your last menstrual period.
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