We look forward to it. Usually, ovulation occurs two weeks before the beginning of the period. Mensen, but not required, each month, so that the calculation of the safe period is based on 12 previous cycles. Let me lead you step by step:
• The first information after the shortest and longest cycle. So, the first fertile day is minus 18 days from the shortest cycle. The last day is fertile minus 11 days with a long cycle.
• Well, as it lasts, you ovulate 14 days 28 day cycle. In other words, 14 days after the first day of the reporting period. To be on the safe side, so that the supply of two more days.
• If your calculations are correct, then it is safe to have sex before the 8 day cycle, up to 8 days after the first day of the period.
• If you have a shorter cycle of 26 days may be, then you will ovulate on Day 13, and if you have a cycle of 30 days to say you ovulate at day 15
The result is that good in math, and it was not for those who do not have a head for figures. I think for most women, safety, or the rhythm method has a high failure rate. You must not forget that at irregular times, and all your calculations and do all of it. If you are still bent on the use of "safe" this method you can also use cream or foam spermicide when condoms were not allowed.
Finally, there is no such thing as a "really safe" safe time.
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