Women of normal childbearing age ovulate, and after sex, the egg and sperm successfully combine, find a suitable place in the uterus and implant, and begin the course of life. Countless sperm are produced during each sexual life, and the egg generally only ovulates once per menstrual cycle, so not every sexual life will produce life. Every menstrual cycle has a safe period. The chance of pregnancy during the safe period is greatly reduced, so what is the safe period? How is the security period calculated?
What is the safe period?
There is a time zone during the safe period, it is safer to have sex during this time period, the probability of female ovulation in this time period is extremely low, and if the woman does not ovulate, the egg and sperm will not combine to form a fertilized egg, and will not become pregnant, so the time period for sex without ovulation in this time period is called the safe period.
How is the security period calculated?
Safe periods are related to ovulation and the menstrual cycle. First of all, for women with normal menstrual cycles. The safety period is relatively stable. Ovulation generally occurs around 14 days before the next menstrual period, and since the survival time after egg release is generally around 1-2 days, the closer to the menstrual period 4 days after ovulation, the safer.
The time between 4 days after the date of ovulation and the onset of the next menstrual period is called the safe period after ovulation. The survival time of sperm in the female reproductive tract is 2 times 3 days, sperm motility is longer, pregnancy is easy 5 days before ovulation day, and it is safe to close to the end of the last menstrual period. The date of clean menstruation to 5 days before the day of ovulation is called the pre-ovulation safe period. Secondly, for women with irregular menstruation. The first thing to do is to determine the period of ovulation, because it is difficult to determine the safe period before ovulation because it cannot be predicted, in other words, the safe period before ovulation does not exist. Through ovulation test strips, ultrasound checks the pattern of ovulation to find the day of ovulation. If ovulation is normal, the safe period after ovulation is generally stable. Because it enters the luteal phase after ovulation. The luteal phase is a preparation for life. If conception is successful after ovulation, then the corpus luteum continues to secrete, and if the corpus luteum atrophys about 14 days into pregnancy, the uterus contracts, and the endometrium sheds to enter the next menstrual period. Therefore, there is usually a safe period of about 8 to 10 days after ovulation. Secondly, the safe period is also related to the length of the menstrual cycle. This is mainly for the safe period before ovulation. Long menstrual cycles also have a long pre-ovulation safety period. Conversely, the pre-ovulation safe period with a short menstrual cycle is also short. After menstruation enters the ovulation period, there is also no safe period before ovulation.
The safe period after ovulation is safer than the safe period before ovulation.
Because the safe period before ovulation is shortened or lengthened by the influence of ovulation, women's menstrual cycles generally do not ovulate twice. However, neither the safe period before ovulation nor the safe period after ovulation can be 100% safe. Therefore, the use of the rhythm method of contraception is very risky. When engaging in sexual activity, other, more effective methods of contraception are recommended.
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