Sperm moving with a middle speed on 3-3.5 mm/min, and 1-1.5 hours leading a uterine cavity, and in 2-3 hours are uterine tubes.

 And therefore syringe after sex as for preventing pregnancy will not lead a goal, if this procedure doing in 5-10 min, and not right away after sex. In uterine tubes, thanks for a having especial substance calling a tube factor, sperms keeping fertilized ability for a few days. And duration for life of a mature egg are calculating by hours. Thus, fertilization ability is higher on a first half mense cycle, when entered in uterine tubes sperm as waiting mature egg, not loosing here fertilizing ability, and a most often pregnancy beginning in sex before 2–3 days till ovulation, or matching with her by time, and soon after her ending. But modern science is a not having right stats and simple methods for defining ovulation moment. As from having methods, an access and right is temperature test. And based on the one from physiologic female s organism pattern: Ovulation happening for her are processes in ovary are tied with a small rising in rectal temperature.

 

1. Days.

2. Cycles days.

3. Menses days.

4. Dangerous period, days are for the most probably pregnancy becoming.

 In 28 days menses cycle on the first 12–14 days a cycle a rectal temperature is 37C lower, for a next day after ovulation temperature rising to 0.5 C, and keeping on the level 37.2-37.5 for a following next are 8-10 days. And before menses temperature is lowering till a normal stats. And check temperature in rectal doing  on the morning, at bed, and writing all stats for 2-3 mnths, and women will define are approximately ovulations dates. And too, additional to temperature test use a formulas and calculations, which also helping to define dates for ovulation precedence. Method 1st. Cycle for menses days separate on 2, possible low birdere for ovulation date dedining with subtractiob from this size a number 2, and top with adding a number 5. As for example in women a cycle gor menses having 26 daysm thus: 26:2=13, 13-2 =11, 13plus 5 =18, thus in data menses duration a most dangerouse period having for 7 days since 11 to 18 days a cycle.These days on avoiding sex contact or use contraceptives items. A few specialists advice to add more care and offering calculation, in which dangerouse periode is prolongation. Method second. From a waiting day mense subtractions a number 16, so defining a top border for ovulation.Top border putting with adding to received a number 4, as for example in 28 days cycle a time for ovulation:28-16= 12, 12 plus 4- 16, thus from 12 till 16 day a cycle. For a most saving in one and other side adding 3 days, thus in data calculation a common duration a dangerouse period keeping from 9 till 19 day a cycle. For a using physiologic method for preventing, you must to know a right to know an own mense cycle, not trust for memory, use calendar, and keeping this systematically. And after calculations, you are consulting with doctor!