Pain behind belly button?!

Angela • Mom to 3

So earlier I was exercising and suddenly got this pain behind my belly button. So I stopped and it went away. Just now I was taking out the trash and it started hurting again. It could be gas but it's weird that it doesn't move and just stays behind my belly button. Baby is fine and still kicking me. Has anyone else had similar pain? Should I be worried?

26w3d