It will feel like period cramps at first( If you have front labor) it will start on your sides and then come around to the front, believe it or not your tummy will tighten up even more. They will increasingly get more regular and intense. Back labor feels a bit different. Kind of starts out feeling like you pulled something in your lower back. The pains fade in and out getting increasingly more intense. Imo back labor is more painful. Good luck :-)
You will know trust me it'll be in ur belly or in ur lower back