Cramps and back pain!

Jamie • I've been married almost 4 year but been together over 5. We already have one perfect son with another one on the way!
I'm having an all over belly cramps that's constant so it's not like a contraction and having breaking back pain. What would cause this awful combination and what can I do to make it go away! I've been resting with my feet up and drinking alot of water!