Is it normal to have tummy cramps?

Yes. Mosy people experience the occasional cramping pain that goes away moments later. If more frequent or associated with significant pain, change in bowel habit (diarrhea or constipation; color, shape), passage of blood (red or darker), fever or weight loss - seek attention.
Poor digestion. Tummy cramps is a very early sign of poor digestion before dysbiosis occurs. The intestine in encountering food that is not yet digested to reset use digestive enzymes before meals and betaine hcl after meals u should see relief within 12 hours.