Hey Mel,
are you regular? (if you catch my drift) I know if I get a bit backed up then I get those types of cramps too. I would say to get it checked out just be on the side of caution but I guess depending on how bad they are.
Also how frequently are you peeing (sorry hun) I had some similar type cramps which have stopped since I had my UTI treated.

Knowing me I would get checked out just in case.

I am sure its nothing though