The first time a girl’s abdomen is swollen and painful may be due to too violent movements and too deep penetration during sex, while the girl’s vaginal contraction due to excessive tension for the first time may cause spasmodic contraction of the uterus, resulting in pain. Hymen rupture can cause mild pain at the vaginal opening. It is recommended to observe first, and if the abdominal distension and pain is relieved after sex for some time, there is no need to deal with it. It is important to consider the possibility of gynecological inflammation. If you are suffering from gynecological inflammation, you may have pain in the lower abdomen or increased leucorrhea, yellowing and other symptoms, and you may have menstrual pain of different degrees during menstruation. It is recommended to pay attention to perineal hygiene before and after sex, and it is best to take contraceptive measures to avoid unwanted pregnancies if you are not planning to conceive.