What are the symptoms of early pregnancy (4th week)

Early pregnancy symptoms: The development of the fetus in the 4th week: During this period, the embryo has \”implanted\” or \”implanted\” in the uterus. Because the embryo is still very small, the pregnant mother is barely aware of its existence. After the fertilized egg implants, cell division continues. At this time it is surrounded by root-like villi. The fetus absorbs nutrients stored in the endometrium through the villi. This villous tissue eventually becomes the placenta, which is of decisive significance to the fetus. Fetal cells at 4 weeks of gestation are divided into ectoderm, mesoderm and endoderm. These cells eventually form different body organs. The uppermost ectoderm forms skin and hair. Fingernails, toenails, brain, spinal cord and nerves; the middle mesoderm forms muscles, bones, genitourinary organs, heart and other organs; the lowest endoderm forms the mucosa, lungs and intestines and connections inside various organs secretory glands of these organs. Early pregnancy symptoms: Physical changes of pregnant mothers in the 4th week: Usually attentive pregnant mothers will usually realize that they are pregnant during this week. If your period is supposed to come but does not come, and your basal body temperature remains high for 14 consecutive days, you may be pregnant. If you are pregnant, your basal body temperature will increase after ovulation and remain high for 14 weeks. If you are not sure whether you are pregnant, you can buy a pregnancy test paper to check, or go to the obstetrics and gynecology department of the hospital to check whether you are pregnant. After pregnancy, the secretion of progesterone in the body changes. Under the action of progesterone, the sphincter from the esophagus to the stomach relaxes. Some pregnant mothers will vomit at this time. At the same time, there are symptoms such as stomach discomfort or dull pain in the lower abdomen.