We all know that women from the development to not pregnant before postpartum menstruation, is a physiological function of women. Then why does not come menstruation when pregnant? Progesterone has the function of maintaining endometrial hyperplasia, and progesterone has two parts to secrete, one is ovarian corpus luteum, the other is placental corpus luteum.
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Why not menstruation after pregnancy: progesterone
Progesterone has the function of maintaining endometrial hyperplasia, and progesterone can be secreted in two parts: ovarian corpus luteum and placental corpus luteum. After each menstruation, the uterus begins to proliferate and thicken under the stimulation of ovarian corpus luteum to prepare the 'soil' for the implantation of fertilized eggs. If there is no pregnancy, the ovarian corpus luteum shrinks after a menstrual cycle. Without the stimulation of progesterone, the endometrium begins to shrink rapidly and shed blood to form menstruation. If you have sex and the egg is fertilized, the fertilized egg will implant and grow in the endometrium in the following days, and with the formation of the placenta, it will produce more progesterone before the corpus luteum atrophy, so as to maintain the hyperplasia of the endometrium, so that the endometrium will not shed blood. This mechanism is to provide adequate nutrition for the fetus.
Women usually release an egg every 28 days, and the egg reaches the uterus through the fallopian tube. However, the uterus does not know whether the egg has been fertilized at this time. The endometrium is only used to prepare for pregnancy - thickening. The thickened endometrium is rich in blood vessels. If the egg combines with the sperm in the fallopian tube to form a fertilized egg, it will release hormone in the endometrium, making the environment of the uterus suitable for the pregnancy of the fetus. If the egg is not fertilized, it can not release this hormone, the endometrium will fall off and form a menstruation together with the egg.
Will menstruation occur after pregnancy
After the woman is pregnant, the ovary stops ovulating, generally speaking will not come again menstruation. However, there are also a small number of women who continue to menstruate in early pregnancy. In the early stage of pregnancy, the level of progesterone in the body is low, the formation of uterine decidua is not perfect, the ovaries still have mature eggs discharged every month, so the uterus will also have periodic bleeding, which is the reason for menstruation after pregnancy. However, due to the gradual formation of placenta after 3 months of pregnancy, uterine bleeding phenomenon that stops, so continue to menstruation after pregnancy time will not exceed 4 months.
Advice: but need to pay attention to menstruation and vaginal bleeding is two things ah. Pay attention to the possibility of bleeding after pregnancy. It may be incomplete abortion or implantation bleeding. It is mistakenly considered as menstruation. Therefore, it is not necessarily pregnancy without menstruation. This is false menstruation. It's just the vagina. It's bleeding.
Pregnancy related knowledge development:
1. If you are a female friend who is always on time for menstruation, you have a history of sexual life but have not taken contraceptive measures. Menstruation exceeds period of a week, so the first consideration is, be pregnant possibility.
2. Early pregnant women, breast will have a little change. The breast will feel a little bigger, and it will become more solid and heavy. Will also feel the breast has a tingling and full feeling.
3. In the early pregnancy of women friends, there will be frequent urination. This is a normal phenomenon without treatment. Some women do it every hour.
3. Female friends will feel weak, tired and sleepy in early pregnancy. But it won't last long. It will be over soon. In addition, early pregnant women also have symptoms of elevated body temperature. And the temperature tends to rise every day.
If you are a female friend who has the above symptoms in the early stage of pregnancy, then you may be pregnant. You can go to the hospital to do a B-ultrasound to confirm. If you are sure that you are pregnant, but now you don't want to have a baby so soon, you need to have abortion operation in time.