Some people may experience early pregnancy reactions at 20 days of pregnancy, including dizziness, weakness, drowsiness, salivation, liking sour food, hating greasy food, morning sickness, vomiting, etc. Some people may experience frequent urination due to the enlarged uterus pressing on the bladder, and the nighttime urine volume is more than the daily urine volume. The breasts will be swollen and painful, the color of nipples and areolas will deepen, and some areolas will have veins showing on the surface. If you have regular menstruation, you should go to the hospital for a gynecological ultrasound around 40 days after menopause to check the development of the embryo. Before the ultrasound, if abdominal pain or vaginal bleeding occurs, you must go to the hospital in time. If there are no abnormalities, some people may also experience painful uterine contractions without vaginal bleeding, bloating, constipation, etc. This is also a normal early pregnancy reaction after pregnancy and does not require special treatment.