What happens when you are 4 weeks pregnant?

By the fourth week of pregnancy, the fetus has grown to about 0.2 cm. It is very small and soft. Miscarriage is most likely to occur at this stage, so you must do a good job of protecting the fetus. Also, you need to pay attention to the fact that the uterus has not changed at this time, and there are not many changes in the pregnant woman's body. Reasonable observation and regular check-ups are required.

What happens when you are 4 weeks pregnant?

The amniotic cavity is formed just after the fertilized egg has implanted. The fetus is now very inconspicuous, about 0.2cm long, very small and soft. The fetus that has just implanted in the uterus does not yet look like a "human" in appearance. Its head is the same size as its body and looks like a fish with four gills and a long tail.

Your baby is now an embryo made up of two layers of tissue from which all of his organs and body parts will develop. The first placental cells implant in the endometrium, creating space for blood flow to the fetus. By the end of this week, the villi covering the fetus begin to proliferate rapidly, supplying nutrients and oxygen and excreting waste. The placenta begins to develop gradually and can begin to provide the nutrients and oxygen needed for the baby's growth.

During this period, the amniotic sac that wraps the fetus will also appear. The amniotic fluid in it will protect the baby as it grows and develops, while the yolk sac will produce red blood cells and transport nutrients to the fetus before the placenta functions.

When the fetus implants in the uterus, the size of the uterus is about the size of an egg, which is no different from before pregnancy. However, after the fertilized egg implants, the endometrium becomes softer and thicker. It takes 7 to 10 days for the fertilized egg to implant in the endometrium, and only then can it be said that pregnancy is achieved.

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The fertilized egg has just implanted this week, and although the expectant mother's body is undergoing tremendous changes, the signs of pregnancy are not obvious. There will be no obvious changes in your body shape and weight, and there will be no visible changes in the size and shape of your uterus and breasts. However, during this period you may experience mild discomfort, possibly "cold-like" symptoms, and sometimes fatigue. Most expectant mothers do not feel any abnormality, but some may experience bleeding during embryo implantation.