When is the menstruation that 30 days comes oviposit period

30 to menstruation may be in the 9 - 18 th ovulation period, details are as follows:

if it is 30 days of menstrual cycle, if 30 to menstruation, generally 14 for ovulation day, and ovulation period is 5 days before and 4 days after ovulation, so 9 - 18 consider ovulation period. But women specific ovulation period will be affected by emotions, diet, drugs, etc., so can not be generalized

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