Hello, An eight week pregnancy cannot cause any increase in the abdominal size. Make sure if the abortion was complete or if the pregnancy is continuing. This excluded, please check if you have added some extra fat on the abdomen. Also, get a proper evaluation by a gynecologist along with an abdominal and pelvic sonogram to look for the state of the internal organs. If everything is fine, it is just that you have added some extra fat and please try to shed it down through exercise and diet control. Hope this helps.