Women have their menstrual cycle since adolescence, which occurs once a month. Menstrual cycles occur periodically, and a series of changes take place in a woman's body. Many women do not know how to calculate their menstrual cycle and are unaware of the changes that occur in their bodies during this cycle. This article will provide a detailed introduction to the calculation method of female menstrual cycle.
1、 Definition of menstrual cycle
A menstrual cycle starts from the first day of menstruation and ends on the day before the next menstrual cycle, usually lasting 28-30 days. The normal range for a menstrual cycle is 25-35 days. Normal menstrual blood is dark red, mixed with endometrial fragments and mucus, with a few small blood clots visible. The menstrual period is generally 3-5 days, with a normal range of 2-7 days. The total amount of bleeding during each menstrual period is around 50 milliliters.
The menstrual cycle is divided into the follicular phase before ovulation and the luteal phase after ovulation, separated by the ovulation day. The length of the follicular phase is not necessarily the same, but the luteal phase is fixed at about 14 days and lasts for two days.
2、 Follicular phase
The period from the first day of menstruation to the day before the peak of ovulation (LH) is approximately 12-22 days, which varies depending on individual constitution. Taking an average cycle of 28 days as an example:
Menstruation lasts about 3-5 days, and on the 7th day, the pituitary gland secretes hormones to stimulate the development of eggs. After the egg develops and matures, the pituitary gland begins to secrete estrogen, stimulating the growth of a group of 3-30 follicles. These follicles were replenished in the last few days of the previous cycle to accelerate growth. When FSH levels decrease, one of the replenished follicles is selected for ovulation, which matures and is immediately dispatched, while the others enter into atrophy, and the first stage ends.
3、 Luteal phase
Everyone's time is roughly the same, from ovulation day to the next menstrual period, usually around 14 days after ovulation, which is the menstrual period.
4、 The safe period of menstrual cycle
From the perspective of contraception, a woman's menstrual cycle can be divided into menstrual period, ovulation period, and safe period. Ovulation contraception is a method of contraception that involves stopping sexual activity during the ovulation period. In theory, it can be explained as one month: firstly, the menstrual period, which refers to the time of menstruation, usually around one week. Pay attention to the two words' left 'and' right ', as the duration of menstruation also varies from person to person, not necessarily one week.
After the end of menstruation, it enters a normal period of no bleeding. About a week later, ovulation arrives. Ovulation is a physiological phenomenon that occurs every month in women of childbearing age, preparing for pregnancy and reproduction. Ovulation period is the easiest day of the menstrual cycle to conceive, which many people refer to as the most dangerous day. Ovulation is actually just a moment, but the activity of this egg cell in the body is relatively slow, so before it dies and is absorbed, it may survive in the female body for about 2 days, so the days of ovulation are all possible for pregnancy.
If the egg cell is not fertilized, it will die and be absorbed by the human body. After about 2 weeks, the next menstrual cycle will come again, exactly 4 weeks, which is one menstrual cycle. Since the luteal phase is usually around 14 days, if the menstrual cycle is normal, the safe period can be calculated.
5、 Calculating ovulation period based on menstrual cycle
The method of calculating ovulation period based on menstrual cycle is also known as calendar method. Menstruation and ovulation are both influenced by endocrine hormones from the pituitary gland and ovaries, exhibiting periodic changes. The duration of both cycles is consistent, with one cycle per month, while ovulation occurs between two menstrual periods. The menstrual cycle of women varies in length, but the interval between ovulation and the start of the next menstrual cycle is relatively fixed, usually around 14 days.
Based on the relationship between ovulation and menstruation, the ovulation period can be calculated according to the menstrual cycle. The calculation method is to start from the first day of the next menstrual cycle, and the last 14 days or minus 14 days is the ovulation day. The ovulation day, along with the first 5 days and the last 4 days, is called the ovulation period. This is the theoretical basis of the safe period contraception method.
For example, if a woman's menstrual cycle is 28 days and the first day of her current menstrual cycle is on December 2nd, then her next menstrual cycle will be on December 30th (December 2nd plus 28 days). Subtracting 14 days from December 30th, then December 16th is the ovulation day. The ovulation period is from December 11th to 20th, which includes the day of ovulation, as well as the 5 days before and 4 days after ovulation. Except for the menstrual period and ovulation period, the rest of the time is a safe period. Sexual intercourse during the safe period does not require the use of any contraceptive drugs or tools.
This article provides a detailed introduction to the settlement methods for women's menstrual cycles. If you are a woman who is well aware of your own physical discomfort and want to know how your menstrual cycle repeats itself, it is best to read the content of this article carefully.
