Eight days of pregnancy means thirty-eight days of menopause, and it is rare to experience a swollen belly at this time. If it occurs, it is an abnormal phenomenon. The first reason is due to pre-miscarriage, it is recommended to take a blood test to find out the status of progesterone and blood HCG, to decide whether it is clinically necessary to give treatment to stabilize the fetus. The second reason is the pain of ligament pulling after uterine enlargement, which will be relieved after rest. The third reason is to exclude the possibility of ectopic pregnancy, which can be initially diagnosed by ultrasound examination and blood HCG monitoring. If you have a swollen belly after pregnancy, it is also recommended not to be overly tired, and to rest appropriately.