In most cases, the uterus will rotate to the right after pregnancy, causing pain on the left side due to the pulling of the uterine ligaments. The other is pathological, if there is a disease such as adnexitis, ovarian inflammation or ovarian cysts, there will be pain in the stomach, which can be determined by an ultrasound examination. If it is determined that there is an inflammatory infection, it can be treated with anti-inflammatory medication, such as gynecological Qianjin tablets or cephalosporin, which will not affect the health of the fetus, and if there is an ovarian cyst or a tumor, it depends on the specific situation.