Stomach pain after eating - 17 weeks

I had zero morning sickness in my first trimester. Now all of a sudden at 17 weeks, I have stomach pain (like the cramps you would get from a stomach virus) after eating dinner. It is fairly intense and makes me feel slightly nauseous. It has happened two nights in a row. I tried eating less and slower tonight, but that didn't help. Is anyone else experiencing this? All advice appreciated.