12 th day almost corresponds to ovulation date. But the date keeps on changing. That's why to get pregnant you need to have regular sex i. E. 3-4 times a week for one full year before you start seeking medical help. If you want to make her pregnant fast then you can follow this calender method. If a women’s menstrual cycle varies from 26 days to 31 days cycle, The shortest cycle (26 days) minus 18 days = 8th day. The longest cycle (31 days) minus 10 days=21st day Thus, 8th to 21st day of each cycle counting from first day of menstrual period is considered as fertile period.
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