After successful preparation for pregnancy, it takes at least 10 days or so for clinical symptoms to appear, and the symptoms are usually not obvious when the time is too early. Sex about 7 days or so to develop the formation of fertilized eggs, can occur in the bed phenomenon, at this time there can be a slight abdominal pain, a small amount of vaginal bleeding, but sometimes the symptoms are not obvious, and not necessarily for the pregnant woman to perceive, some pregnant women may not have any symptoms. Around the 10th day of pregnancy, as the trophoblast cells in the body start to secrete human chorionic gonadotropin, the body can produce changes, such as nipples and areolas become bigger and deeper in color, and Montgomery’s nodes appear in the areola area, and frequent urination can occur as the uterus grows bigger and presses on the bladder in front of the body. Pregnancy reactions such as liking sour food, nausea, and morning sickness can occur even later in time.