I'm in college so I have to use public restrooms all the time which makes me really nervous. There was a tiny bit of dried. blood on the toilet seat and I wiped if off with a tissues. And the cut is on the back of my finger so I don't think it touched anything. But it may have gotten close. And then what if when I opened the door there was blood on the handle and it happened to get into my cut. Could I get hiv from this?