about a month ago I shut the nails portion of my left ring finger in the car door. I immediately opened the door but not soon enough. The impact cut my finger at the very bottom of my fingernail. It bled some but I put ice on it right away. Now it is no longer painful but the nail is black about half way up.. At the bottom of my nail there isa dotted white line and the nail seems a little disconnected but not loose. Will I lose the nail?