Question about a small black spider on my strawberries?

I bought some strawberries at the supermarket, and as I was washing a few of them to eat, I noticed a small little black spider (tiny, a little bigger than a strawberry seed) crawling on one of the berries that I left in the container. Is there any spiders that are known to live on strawberries? If so, is it poisonous? Please help, I'm kind of concerned. I don't think it bit me, I just crushed it with my thumb.