Most often a woman can not tell when exactly the conception occurred, but the date of the onset of the last menstruation can, say accurately.

Menstruation is the normal periodic flow of blood, mucus and egg residue from the uterine cavity. This occurs at more or less regular intervals from the age of 12-13 years and continues until the onset of the climacteric period (about 50 years). This regular process is interrupted usually only during pregnancy and breastfeeding, as reported by the Internet publication for girls and women from 14 to 35 years old Pannochka. net Usually the interval between menstruation is 28 days, but it can be 21 days, and even 35 days, and nothing abnormal in this. Actually menstruation in most cases lasts from 4 to 6 days. Discharge from the uterus is a mixture of the rejected mucous membrane of the uterus and blood. There may also appear coagulated blood clots. On average, during menstruation, a woman loses 25-60 ml of blood. The blood loss among different women can be different, and one woman - vary from one cycle to another. In an organism of the woman practically two simultaneously important biological cycles. As a result of the ovulation cycle (ovulation), a mature egg appears ready for fertilization, and during the endometric cycle, the uterine wall is prepared for the implantation of a fertilized cell. Both cycles are closely related to each other, because endometrial changes are regulated by hormones that are secreted in the ovaries.

Normal alternation of ovulation and menstrual cycles (with the formation of one egg for fertilization) is the rule, and not an exception. Some women experience uneven cycles of egg production. Such cycles can take place without ovulation. This is a rather rare phenomenon in comparison with regular and predictable menstrual cycles and hormonal changes. The natural purpose of the ovulation cycle is to produce an egg for fertilization.

During the ovulation cycle, 20 or more follicles can begin the process leading to ovulation. And only one of them, bursting, can turn into a mature egg.

Some women (about 25%) experience pain in the lower abdomen or discomfort on the day of ovulation or the next day. Pain is not necessarily felt in every cycle. By the presence or absence of this symptom, you can judge whether or not ovulation has occurred. If it occurred, and a mature egg "met" with a sperm, then conception occurs. It's done! The countdown of a new life began.

Date of birth calculation.

For most women, the most likely period of fertilization (ovulation) is in the middle of their monthly cycle, in other words - two weeks before the start of the next menstrual cycle. Based on this date, the pregnancy lasts about 280 days, or an average of 40 (38-42) weeks, if you count from the beginning of the last menstrual cycle. Thus, you can get an estimated date of birth, adding 280 days to the date the bleeding started in the last cycle. The same result can be obtained if you add 10 days to the date of the last menstrual cycle and subtract 3 months. These calculations are approximate. The exact date of birth will be called by you doctor, based on the results of ultrasound.

Many calculate the time of pregnancy in weeks. This is a simple and convenient way to avoid confusion. For example, if your doctor says that you are pregnant for 10 weeks (do not forget that the account is from the beginning of the last menstrual cycle), then conception occurred about 8 weeks ago and birth will begin in 30 weeks, because the total gestation period is 40 weeks.

There is also a large unit of measure - trimester. Trimesters divide pregnancy into three phases. Each such phase, with a duration of 13 weeks, has its own characteristics. For example, miscarriages (spontaneous abortions) usually occur in the first trimester.

This is a period of rapid formation and development of the child's organs. And in the third trimester, the most likely manifestation of pregnancy-related hypertension (high blood pressure), | toxemia (presence of toxins in the blood) and late toxicosis.

Perhaps you've also heard about another unit of time - the lunar month. It corresponds to the cycle of changing the lunar phases and is 28 days. The full term of pregnancy is 10 lunar months of health. Sumy. Ua.

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