Abdominal swelling and pain in early pregnancy is generally caused by hormonal changes in the body. Early hormonal changes in the body can cause breasts to cause small abdominal swelling and pain, which are normal physiological reactions after pregnancy. However, if there is a paroxysm of pain, it is considered to be a contraction of the uterus, which may be caused by pre-eclampsia, so you need to go to the hospital for an ultrasound examination and progesterone test. In the early stages of pregnancy, it is advisable to take more rest, prohibit intercourse in the first trimester, and take folic acid tablets and go to the hospital regularly for pregnancy tests.