Brown Recluse

This morning I found a brown recluse spider - in my bed. It was dead, squashed, I'm assuming victim to the weight of my own body. The question is: did it bite me before I unknowingly yet mercilessly ended its life? If it had bitten me, would I know by now? Let's say the bite is in the middle of my back where I can't see it. Would it itch or burn or anything like that? I have a student who was out for two days last week recovering from a nasty recluse bite on his leg. I saw it. Any experts out there?