Ay, cramping after eating habang pregnant can happen talaga, especially as baby grows and pushes on your stomach, a few of my pregnant friends experienced that din, but since you're 22 weeks, mas better to mention it sa OB mo next visit para sure lang na lahat okay with baby. Baka kailangan lang ng smaller, frequent meals or mas mabagal kumain, pero your doctor should check kung normal cramping lang or something else na need attention.