If this carries on for more than a couple of days, *do* go to the vet.
And if it carries on for any significant time (like more than a fortnight), insist on a full checkup, and make sure it includes ultrasound. Judi had an intersusseption (gut rolled up inside itself) which very nearly killed her. Our original vet didn't really take it seriously, and the emergency 24-hour place (who we got to know very well) did X-rays but couldn't do ultrasound, so we carried on with her apparently getting better and then relapsing worse. It wasn't until it reached real emergency levels (like about to die within a day) that we got referred to an animal hospital who could do ultrasound, which showed the intersusseption clearly, and she then needed an emergency op that day to fix it.
Moral of the story: X-rays find swallowed objects, blood tests and stool samples find swallowed substances and kidney problems, "digital examination" (finger up the bum!) finds constipation, but for any other problems in the gut there's no alternative to ultrasound. It ain't cheap, but it's a damn sight cheaper than multiple trips to the 24-hour vet and emergency ops.