I would not get yourself all worked up about this. For nearly 4 years, I was on a monthly dose of Remicade at the 10 dose, along with weekly methotrexate injections. It is very easy to scare yourself about getting an infection. The truth is, you still have an immune system, but it has just been compromised to that of a normal person. Yes, we are still able to get infections easier, but don't get to the point that you are worrying about everything. Stress is worse on your body.
There are germs and bacteria everywhere. We carry staph on our skin all of the time, but very few get it. You are right in that you should still be conscious of your nurses technique and cleanliness, but just putting a needle on a table is no reason to report someone. Did she steralize the needle before or after? Did she steralize your skin with an alcohol pad?