This may seem like a stupid question, but i have a concern. Last week, i was in a store, and while i was waiting, i sat down on a chair. My hand wandered to the crack in the side of the chair, and then my finger was pricked by a piece of glass or sharp plastic. It drew a little blood from my fingertip. I don't know how long it had been there(it was covered in dust, though), and i did not look to see if there was any blood on it. I read that HIV can last up to 7 days in the environement, and i have been feeling very tired recently... could i have contracted the virus? Should i think about getting tested? Thanks for any responses!