What does pregnancy mean?

Everyone should know about pregnancy, that is, the process of pregnancy for women. Pregnancy also has many reactions, especially some reactions in the early stage can well indicate whether you are pregnant. In the early stage of pregnancy, menstruation will stop. Generally, if menstruation is delayed for more than 7 days, you should consider whether you are pregnant. There will also be symptoms such as loss of appetite, nausea, and frequent urination. Let's take a closer look at what pregnancy means.

What does pregnancy mean? What we are referring to here is the phenomenon of a woman becoming pregnant. Pregnancy is also called pregnancy in medicine. The entire pregnancy process will last 280 days. During this stage, especially in the early stages of pregnancy, there will be a series of reactions, also known as morning sickness. Everyone should pay attention to their bodies at different stages of pregnancy.

The entire pregnancy process is 280 days, and 28 days is one gestation month, so the entire process is 10 gestation months or 40 weeks. Since the date of egg fertilization is not easy to determine accurately, it is called the expected date of delivery (EDC). The method to calculate the expected date of delivery is: starting from the first day of the last menstrual period, add 9 to the month and 7 to the day; or subtract three from the month and add 7 to the day. In the lunar calendar, add nine and subtract three to the month, and add fourteen to the day. If the menstrual cycle is prolonged or shortened, the expected date of delivery should be increased or decreased accordingly. The actual delivery date may differ from the estimated expected date of delivery by 1 to 2 weeks. During pregnancy, the fetus and its appendages develop inside the pregnant woman's body, and many changes also occur in the mother's body. These are physiological changes, but if the changes exceed a certain limit, they become pathological phenomena.

Clinically, pregnancy is divided into three cycles: before the 13th week of pregnancy is called early pregnancy; the 14th to 27th week of pregnancy is called mid-pregnancy; and the 28th week and later is called late pregnancy.

Pregnancy conditions

1. There must be healthy and mature sperm and eggs.

2. The channels for sperm and egg, including the vas deferens, male urethra, vagina, cervix, uterine cavity, and fallopian tubes, must be unobstructed and function normally.

3. The sperm and egg must meet. If a woman has regular menstruation, ovulation usually occurs 14 days before the next menstrual period. After the egg is released from the ovary, if it is not fertilized within 24 hours, it will begin to degenerate. The best time for fertilization is within 15 to 18 hours after the egg is released. There is no definitive answer to how long sperm can survive in the female reproductive tract, but it is generally said that they are capable of fertilization within 1 to 3 days after sexual intercourse.

4. For the fertilized egg to implant, there must be a suitable internal environment, that is, the endometrium must undergo secretory phase changes.

5. The development of the fertilized egg must be synchronized with the endometrium, that is, the fertilized egg on the 7th to 8th day must be implanted in the endometrium 7 to 8 days after ovulation.

Pregnancy Tips

Pregnancy is the process of creating a new individual, including fertilization, implantation of the fertilized egg, its entire development and growth in the uterus, and delivery.

After the egg is discharged from the follicle, it is drawn into the fimbria of the fallopian tube. Driven by the smooth muscle of the fallopian tube and the cilia of the epithelial cells, the egg is pushed to the ampulla of the ampulla, where it combines with the sperm and is fertilized. Generally speaking, out of 100 million sperm, only about 200 can get close to the egg. Only one of them will be able to combine with the egg and fertilize it. The fertilized egg moves in the fallopian tube while undergoing cell division to form a blastocyst. After about a week, the blastocyst enters the uterus. The functioning of the blastocyst can only proceed normally when there is an appropriate ratio of estrogen to progesterone. The process by which the blastocyst interacts with the endometrium and implants into the uterus is called implantation. The blastocyst produces human chorionic gonadotropin (hCG), which can stimulate the corpus luteum to continue to secrete progesterone to maintain the endometrium and facilitate the implantation of the blastocyst into the endometrium. Some trophoblast cells of the blastocyst and maternal cells form the placenta. The function of the placenta is to enable the exchange of substances between the fetus and the mother and to produce several endocrine substances to maintain pregnancy. Two weeks after conception, the secretion of pituitary gonadotropin decreases, and the corpus luteum continues to grow and secrete progesterone and estrogen under the action of hCG. Some people have detected hCG in the maternal blood one day after the blastocyst implantation. It is basically similar to LH in biological and immune effects. The secretion of hCG reaches its peak at 8 to 10 weeks of pregnancy. After 8 to 10 weeks, hCG concentration decreases. But at this time the placenta begins to produce progesterone and estrogen. Therefore, the maintenance of progesterone and estrogen before 8 to 10 weeks of pregnancy mainly depends on the stimulation of hCG on the corpus luteum. After 8 to 10 weeks, progesterone and estrogen are secreted by the placenta. The human gestation period is about 280 days. During pregnancy, under the action of estrogen and progesterone, the uterus increases significantly to adapt to the growth of the fetus. The mammary glands also increase in size and develop significantly, preparing for breastfeeding. In the late pregnancy, as the excitability of the uterus increases, irregular contractions begin to appear, and then become rhythmic contractions, which can fully dilate the cervix and force the fetus to squeeze towards the cervix. This can further cause the contraction of the uterine body to increase, further forcing the fetus towards the cervical opening. The pressure of the fetus on the cervix can cause the neurohypophysis to release oxytocin, making the uterus contract stronger. These two positive feedback effects continue until the fetus is completely delivered. Finally, the placenta is delivered and the delivery process is over. As the uterus contracts, it can also reflexively cause the abdominal wall muscles and diaphragm to contract, assisting in the delivery of the fetus.

I believe everyone should know what pregnancy means. Women who have had pregnancy experience should understand some things about pregnancy, especially the reactions that occur in the early stages of pregnancy. Many women use these reactions to determine that they are pregnant. If you are pregnant, you should be able to do B-ultrasound regularly to further understand the baby's development.