It isn't clear, did you spill blood from a test tube on an open wound or this is just a nightmare? If you really did this, you work in a hospital, talk to someone there about it. If it's your imagination, well, we all have nightmares, and sometimes they stick around a while in our minds. If you have a phobia about getting a disease from blood, and you work in a hospital, you probably would benefit from seeing a therapist, as you kind of need to get over it. Assuming you actually do work in a hospital and that's not just part of your dream. Hard to tell. More info and clarity might help. Peace.