Rolling feeling in stomach

For the past few months ive been feeling a rolling feeling in the top of my stomach and felt it at the bottom of my belly tonight. Sometimes ill feel something quickly push into my stomach from the inside, and sometimes its a light little push into my stomach. Ive taken pregnancy tests because me and my boyfriend had a pregnancy scare about 6 months ago. Ive never been pregnant so i dont know what a baby even feels like. Anyone have an idea what it could be? I go to a doctor soon.