HIV question

I'm hoping I'm just overreacting but I'm paranoid and want to ask anyway. Last night I was sharing a blunt with a couple people I just met. I had a few cuts in my mouth. Sometimes when I'm stressed I'll bite the inside of my mouth. Is it possible to contract HIV from sharing a blunt with someone? they didn't have any noticeable cuts or anything and of course I have no idea if they have hiv or not. I know they say you can't get it from saliva but I can't help but be paranoid if maybe they had an open wound or blood or something in their mouth.