The fact that your stomach hurts after ovulation does not confirm that you are pregnant, and it is not possible to determine whether you are pregnant or not. Although the lower abdomen may feel swollen and uncomfortable due to the enlargement of the uterus in the early stages of pregnancy, there are other causes of vague pain in the lower abdomen. For example, the common pelvic inflammatory disease may also cause vague pain in the lower abdomen. In addition, ectopic tubal pregnancy may also cause vague pain in the lower abdomen. Therefore, it does not necessarily mean that you are pregnant, but there are other tests that should be performed to determine if you are pregnant. The most common tests include blood HCG and ultrasound of the uterine adnexa. The diagnosis of pregnancy can only be made by ultrasound of the uterine adnexa, where the yolk sac of the gestational sac can be seen in the uterine cavity and the fetal bud and heart can be seen.