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So figuring out when to have sex to avoid pregnancy can be very difficult, if not impossible.
If day 1 was on the 4th of the month, youll mark X on the 11th.
Thats because there is no sure way to know when a woman will ovulate.
Then subtract18 days from the total number of days of your shortest cycle.The menstrual cycle is the time from the first day of your period to the first day of your next period; for most women, that is about 28 days.About 12-14 days before your period begins, you are most fertile.Subtract 11 from the total number of days in that cycle.For example, if your longest cycle is 30 days long, subtract 11 from 30 you get.Your menstrual cycle begins on the first day of your period and continues up to the first day of your next period.Next What's the Standard Days method?Avoid Your Fertile Days, another way to know the best time to have sex is to avoid your fertile days, which depends on different cycle length.The luteal phase (or secretory phase) is the latter phase of the menstrual cycle.Ovulation time vary for each individual, and can occur from 12th to 19th day of the cycle.Though for most women the time of ovulation is right at 12-14 days before they begin their period, some women have different schedules, and are fertile at different times.Proper use of Safe Period Calculation method along with coitus interruptus (withdrawal method or pull-out method) is a suggested as a sin free or green family planning method for couples with self control over sexuality.World Health Organization (WHO) data shows that approximately 80 of menstrual cycles ranges from 26 to 32 days, and this safe period calculation system is adjusted to reflect these data.Currently there are several methods of natural family planning, like rhythm method and mucus method are used by peoples around the world and they are less reliable as a birth control method.You should always use contraception when you have sex if you don't want to become pregnant.
It's important to remember that sperm can sometimes survive in the body for up to 7 days after you have sex.
But if you have a regular menstrual cycle lasting around 28 days, 7 days before your period and 7 days right after your period are generally the safe window.
If fertilization does not occur within that time frame, the egg will die.
Who cannot use Safe Period Calculator?