Today i had contraction like pain that i think may have been gas; now the pains are mostly gone and the baby is moving like crazy; should i go in?

Use your judgement: Without knowing how far along you are or whether your pregnant is risky for other reasons, it is hard to answer your ? With confidence. So it is up to you to seek care if you think it is needed & you should if you feel a drop in movement, see bleeding, or should the pain return. But I do feel some relief in knowing the pain was short-lived and your feeling the baby move so well. Good luck.