Is it not good to run after eating?

so i run around 3-4 miles a night, or sometimes in the morning if ive been busy. but last nite i ate dinner and it wasnt a heavy dinner it was rlly heathy, im a vegan, so i dont eat dairy or meat. i had boiled squash w/seosing on it, with pineapple slices and grapes as a side(ik its a wierd combo), then i had a couple saltine crackers. i usually run when i have a semi-empty stomach or im hungry. but after eating dinner i went to run rite away at like 9:00. as i was running i felt rlly sluggish and felt the food jumping in my stomach.literally. then after running a mile or so i got intense cramps that casued me to have to stop and walk which i hated, it was so painful tho. i never get cramps running. is it not good to run directly after eating?how long should i wait to run after eating? it was probs the most pathetic run ive ever done haha