Early embryos are generally those within 10 weeks of pregnancy. In general, after the sperm-egg union, 35 days after menopause can be seen by ultrasound the gestational sac echoes, about 6 weeks after menopause to see the fetal heart buds, 8-10 weeks to begin to establish the function of the placenta, 10 weeks of pregnancy within the human embryo is called the embryo, is the period of organ differentiation and formation. So usually the gestational sac seen before 10 weeks of pregnancy is called the early embryo. From the 11th week of pregnancy onwards it is called the fetus and is the period of growth and maturation. Early embryonic sacs are relatively fragile and sensitive and are prone to miscarriage. Therefore, it is important to remain emotionally stable and also not to have sex during the early stages of pregnancy. Therefore, patients in the early stages of pregnancy need to develop good habits, maintain a good state of mind, and undergo regular checkups.