Stomach pain after sex can happen for several reasons, ranging from temporary discomfort to an underlying medical condition. Deep penetration, muscle tension, gas, or bladder irritation may cause cramping or abdominal discomfort. In some cases, conditions such as uterine fibroids, ovarian cysts, endometriosis, or pelvic infections can contribute to pain during or after intercourse. The location, severity, and duration of the pain can provide helpful clues about its cause. If pain is severe, persistent, or occurs frequently, it is important to speak with a healthcare professional. USA Fibroid Centers can help evaluate whether fibroids may be contributing to pelvic discomfort.
https://www.usafibroidcenters.com/blog/why-does-my-stomach-hurt-after-sex/