3 week of pregnancy has come. What new will appear in these days in the life of a woman? What are the joys and worries associated with this time? The most important moments, information and advice are all for expectant mothers. Two views on the term For convenience, any doctor will count from the first day of the last menstrual period of a woman. On this system, the concept of an obstetric term is based. According to another system (embryonic), the term is considered from the middle of the cycle. It is at this time most often occurs ovulation and conception. In midwifery practice, the third week is the period of fertilization. The egg ripens and moves to the uterine cavity. At some point, the sperm penetrates into it, and then the movement will continue to be a zygote. This new cell has a full set of chromosomes and is capable of very rapid division. According to the embryonic method, once a single cell already develops a violent activity and actively lives its special, s...