A vet check won't do any harm. It does look a little unusual to me.

A gravid snake about to lay should be lying on the heat source in a perfect coil when she isn't moving around restlessly and twisting her body to move the eggs into position. If she's not doing that, I'd do the vet. If she is, then I would spray her bin down good to spike the humidity, and leave her alone completely for 48 hours. (No peeking).

My snakes all prefer to lay when undisturbed--I usually find eggs after I've left them alone for over a day.