You wrapped that sucker tightly, didn't you?!? Good job. A word of caution-it isn't the safest thing to bend back a used needle. You probably already know that, but if you find yourself in this situation again, clip off the top of a pencil eraser and embed the needle in it. Or you can use a wine cork.
I work in the OR, so the risk for needlestick injuries is high. I got my first needlestick when I was scrubbed in for a Vag Hyst. The pt was in lithotomy and the surgeon was to my left. The back table was behind the surgeon about 2 ft away. I had to stand sideways so that I didn't contaminate the back table with the back of my gown. The surgeon reached back and put a used 2-0 Vicryl on the back table and asked for 3-0 Monocryl. As I was reaching for the needledriver on the back table to change out suture, she changed her mind and without looking at me, she grabbed the driver back, sticking me in the process. She cursed me out for not being careful with sharps. She never apologized. So much for the hands-free zone, eh?
Another time, I was holding retractors for another vag hyst. My back was facing the pt's head and I was leaning over the pt's left leg. He was using the pt's belly as a mayo stand (I know, real nice, huh?) and threw a big honking 2-0 Nylon up, tearing my glove and grazing the back of my hand. It didn't bleed, but the skin was broken. The surgeon was very apologetic, and I gave him a piece of my mind for being careless AND for using the pt's belly as a mayo stand. I filled out an incident report, did the whole needlestick protocol, etc. So my nurse manager calls me into her office the next day and demands to know why I wasn't more careful. HUH? I felt like I just entered Crazytown.
Thank goodness neither of these pt's had anything dirty in their blood. I have known other nurses to be on the unfortunate side of dirty needlesticks. It is always a very scary ordeal.
To answer your questions, yes-you can be stuck and not know it, especially during a trauma case. If any sharps break the skin, it is considered a needlestick injury.