How to calculate dangerous days for pregnancy
How to calculate dangerous days for pregnancy
Physiological method of preventionAn unwanted pregnancy has its advantages and disadvantages. It implies abstinence from sexual activity in the phase of ovulation or the use of additional contraceptives during this period.
You will need
- - the calendar;
- - thermometer;
- - Notepad.
Instructions
1
Please note that this method isObservation of a woman for her menstrual cycle for six months. This helps to more accurately determine its fertile phase, or phase of ovulation, - a time favorable for conception.
2
It should be borne in mind that a healthy womanovulation (egg yield from the ovary) occurs approximately in the middle of the menstrual cycle - the interval between menstruation. Since fertilization occurs with the participation of male and female sex cells, in determining the "dangerous" days for pregnancy, their "life span" is necessarily taken into account. As a rule, in an ovum it is up to 2 days, and in a sperm - 2-4 days.
3
To determine the days that are favorable for conception,select menstrual cycles with the shortest and greatest duration. For example, it's 27 and 30 days. Of the value of 27, 18 (27-18 = 9) should be subtracted, with 18 including 14 days (the average period from ovulation to the next menstruation) and 4 days of viability of spermatozoa. From the number 30 we subtract 11 (30-11 = 19), 11 - 14 days from ovulation to menstruation and 3 more days for insurance. We get a "dangerous" pregnancy period from the 9 th to the 19 th day of the menstrual cycle. However, the exclusion of 10 days of normal sex life is not suitable for every woman.
4
To calculate the "dangerous" days for pregnancy,You can use the basal temperature measurement method, which is more convenient and reliable. The procedure is performed every morning after awakening, but before ascending from bed, for three months. Based on the obtained indices, basal temperature charts are compiled. At the beginning of the menstrual cycle, it fluctuates between 36.6-36.7 ° C, at the time of ovulation - it becomes even lower (36.2-36.4 ° C), after which it rises sharply and lasts about two weeks at around 37, 0 ° C. To determine the period that is favorable for conception, one should add to the ordinal number of the day of the cycle in which ovulation was noted, plus - minus three days (the average life of the sperm).
