##### Method of safety period calculation

Menstruation is safe period 8 days of is adult lady menstruation after day and the before 7 menstruation that basically are period are safe period, basically be major person is used at using contraceptive the means of a few computation of measure, divide pressing day of number plan is to also have standards of a few basic human body temperature and way of watch of a few calendar, what remove be placed in the middle in the life also is relatively general basically is to be in be being calculated in what what the life removes be placed in the middle can be in accordingly before menstrual menarche the next time also is special simple basically is, begin calculate.

Advocate if cycle of a few physiology calculates law and watch of a few calendar,secretion of female of method of test of oviposit period temperature observes, of his common problem basically is every month comes the menstruation of the period that menstruation comes to comes the menstruation of tide and period of its next month comes wet the first day say for cycle of a physiology.

It is calendar to express a law by what the way that physiology cycle calculates oviposit period says again. Period is mixed oviposit period suffers the endocrine with pituitary issueing grave and ovarian uterus to grow of hormone affect and show regularity change, the periodic time length of both is consistent, it is every month completely a periodic time, and oviposit period generation is in twice in the middle of menstruation. Physiology cycle accident of the lady is differ, but oviposit period and the next time period just began the time-interval among relatively fixed do not move, fluctuate in 14 days commonly. Basis oviposit period with this kind of correlation among period, can calculate oviposit period by physiology cycle. Calculating means is the following the 1st day of menstrual menarche calculates case, finally 14 day or decreasing 14 days is oviposit period, oviposit period and after before 5 sky 4 days add in those who say it is oviposit period. This is the fundamental theory basis of safety period contraception. For instance, some female physiology cycle is 28 days, this the 1st day of menstrual menarche is in on December 2, that Zuo the next time menstrual menarche is on December 30 (will add 28 days of) on December 2, decrease 14 days from December 30 again, criterion December 16 is oviposit period. Oviposit period and after before 5 sky 4 days, namely 11-20 day will be oviposit period in December. Divide physiology period and oviposit period, menstrual safety all is between other period. In menstruation safety period sexual life but need not choose all prophylactic content and contraceptive measure is special tool.

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