I've been having tightening feelings in my lower abdomen and sharp burning pains in my bladder off and on since last night. What am I feeling?

Is it time to ask your Doctor who is familiar with your pregnancy and your due date if there is a problem or if you're going into labor?

Im 36w+1d.. Could it be labor? It hurts, but not bad.

If it's in your lower abdomen it's most likely round ligament pain. At 36 weeks your abdomen is growing quickly and these ligaments stretch. If you are in an area of the world where it is hot, you could be dehydrating which exacerbates these pains.

Drink plenty of water and don't chew ice. Labor pains are usually in your upper abdomen around and above your belly button.