The food will kill any bugs that might be in your stomach.
A few weeks ago I sprayed the inside of my microwave because I saw a cockroach. I know it was pretty stupid, was not thinking straight at that time. I didn't use it for a few weeks now because of the incident. But yesterday I got really hungry and too lazy to go out so I heated some food in the microwave. I wonder if its alright to reuse it. And no I did not clean the microwave. Is it safe to still use it ?