Does the first day of menstruation count as the night?

Menstruation can occur at any time of the day, so the menstrual period is calculated based on 24 hours, rather than starting from the morning at natural time. Therefore, if your period comes at night, it can certainly be counted as the first day, but it will not end until the night of the next day (that is, a full 24 hours), and the second day will still be counted from night. And so on, until the end of the menstrual period, look at enough 24 hours, that is a few days of menstrual bleeding time - menstrual period. Calculating menstrual period in this way is scientific, accurate and convenient.

How many days of menstrual cycle is normal? The menstrual cycle is generally 21-35 days, with an average of 28 days.

Normal menstruation is regular. How to calculate the menstrual cycle? The first day of menstrual bleeding is regarded as the beginning of the menstrual cycle, and the time interval between the first days of two menstrual periods is called a menstrual cycle.

How many days is a normal menstrual cycle? The length of a woman's menstrual cycle varies from person to person. The normal menstrual cycle is 28 days. Occasionally, it may be early or late for no more than 7 days and it can still be considered normal. That is, the menstrual cycle cannot be less than 21 days, nor can it exceed 35 days. Such a menstrual cycle is normal.

How do you know if your menstrual cycle is normal? The length of menstrual cycle varies from woman to woman. It is within the normal range if the menstrual cycle is 7-10 days earlier or later. As long as the menstrual cycle is maintained at a certain regularity, it is not considered as irregular menstruation.

The physiological cycle is also called the uterine and ovarian cycle, which is divided into four stages, including the follicular phase, ovulation phase, follicular phase and physiological phase:

1. Follicular phase: The follicular phase is from the first day of menarche to ovulation. During this period, under the influence of follicle-stimulating hormone, the body's estrogen and testosterone concentrations increase, the follicles gradually mature, and the endometrium thickens.

2. Ovulation period: Ovulation period refers to the whole process of the egg and the surrounding cumulus granulosa cells being discharged together. Women's ovulation period is generally about 14 days before the next menstrual period.

3. Follicular phase: The follicular phase refers to the period from ovulation to the day before menarche. The uterus and ovaries are affected by luteinizing hormone, which metabolizes luteinizing hormone to maintain the thickened uterine wall to facilitate the combination of sperm and egg and implantation. If there is no sperm and egg, the uterine wall will collapse, and the physiological cycle ends with the menarche.

4. Menstrual period: The duration of each menstrual period is called the menstrual period, which is generally 2-8 days, with an average of 4-6 days. Generally, there are no special symptoms during the menstrual period, but due to pelvic congestion and the action of prostaglandins during the menstrual period, some women will experience a feeling of heaviness in the lower abdomen and lumbar region or uterine contraction pain, and may also experience gastrointestinal disorders such as diarrhea.