The embryonic period of development lasts from the moment of fertilization until 8-9 weeks of pregnancy, when the embryo acquires characteristic human features.
1 week of pregnancy.
During this period, follicles mature in the ovaries, one of which will contain that fateful egg.
There is no embryo yet, but serious preparatory work is underway for its appearance: the uterine cavity is cleared of the endometrium, which was not useful in the last cycle, vesicles-follicles with developing eggs inside are maturing in the ovaries.
2nd week of pregnancy.
Still no child. But the process of its emergence is rapidly progressing. The most active follicle ruptures and releases an egg ready for fertilization. And when the fastest and most tenacious sperm reaches this mature egg, it breaks through its shell, the nuclei of male and female cells merge and a new life is conceived.
3rd week of pregnancy.
During this period, a germinal disc with a primary streak is formed - from many cells that are constantly dividing and developing. The size of a fertilized egg in the 3rd week of pregnancy is about 0.13 mm.
4th week of pregnancy.
By the beginning of the 4th week, the fertilized egg enters the uterine cavity, attaches to its wall and continues to develop. The germinal disc takes on a cylindrical shape, and the head and tail of the embryo are formed. By the end of the 28th day, a bend of the body appears, the length in the back reaches 4-5 mm.