After having sex during ovulation, some people may experience pain in the right lower abdomen. This can be due to a number of factors, such as:

2. Intestinal infection: If the implantation of the fertilized egg occurs in the context of intestinal infection, it may cause pain in the right lower abdomen, usually manifesting as pain, diarrhea, constipation and other symptoms.

3. Uterine contractions: During the implantation and development of the fertilized egg, the uterus may contract, which may cause pain in the right lower quadrant, usually manifesting as pain, discomfort, and bleeding.

4. Other complications of pregnancy: In addition to right lower abdominal pain, there are other pregnancy complications that may cause lower abdominal pain, such as contractions, flu, headaches, nausea and vomiting, etc.