Help!!!

About every other night I've seen rats in my grill and tonight my boyfriend bought some steaks to cook on the grill and says it will be fine.. He found one rat dropping in the bottom of the grill and says that the fire will kill any germs.. But I really don't want to eat anything out of the grill but he is trying to cook the steaks tonight and just now fired up the grill.. He won't listen to me and thinks I'm crazy.. I'm about 27 weeks pregnant and don't want to risk anything.. Am I crazy??