Having a baby made my cramps go away. For good. It's like my uterus and I have a pact...don't give me cramps and I won't stretch you to the ends of the universe again!!
BUT...back in my day, I used to have horrendous cramps and walking or exercising always, always helped. Now, I have some months that are heavy and a little crampy (not like before motherhood, just slight touchiness) and some that are really whimpy...no cramps whatsoever and very light flow.
Good luck...I wouldn't worry, but if you have good insurance, by all means check it out with your doctor...or sometimes you can just call the office and talk to a nurse and she'll reassure you if your really worried. And it's free