Generally speaking, after 21 days of pregnancy, when the fertilized egg is successfully implanted, the pregnant woman’s chest may begin to swell, but there are also individual differences. Fertile women in the ovulation period about 7 days after intercourse, the fertilized egg successfully implanted in the body after estrogen and progesterone levels began to rise, so in the 21 days after pregnancy, some pregnant women will begin to feel the chest swelling, at this time you can also test the blood HCG (human chorionic gonadotropin) to confirm the pregnancy, but there will be individual differences, and some pregnant women may not have any reaction. Some pregnant women may experience early pregnancy reactions and frequent urination at around 6 weeks of pregnancy, and an ultrasound is performed at around 6 weeks of menopause to confirm a normal intrauterine pregnancy. After a clear diagnosis of early pregnancy, pregnant women should also pay attention to appropriate rest, avoid strenuous exercise and exertion, appropriate increase in diet and nutrition, and continue to follow the doctor’s instructions to take folic acid on time.