I am not a NICU preceptor so I can't really tell you for sure, but I am inclined to think that it is not appropriate for your preceptor to leave the floor for that period of time. Even if she feels you are very competent and will be fine to be alone( which is probably why she is leaving you), They should still be close by in case you have questions.
I mostly wanted to respond becaue I can completely relate to you because I also had an infiltrate on orientation!!! I know exactly how you feel, I went home and cried, it was all I thought about for days.
Believe me, you will be OBSESSED with checking your iv sites from now on, and that is a good thing
. You will get over it, I did. And you will learn from it. I have been on my own in the NICU for a couple months now, and it is tough. But I ask a million questions. We have a few nurses on nights who are very seasoned and know everything but don't like orienting or helping new grads. I get some pretty snippy replies sometimes, but I don't care. I still ask! Rather that than make a mistake.
You will be fine. Almost every NICU nurse I know has made a mistake that "haunts" them. I still think about that TERRIBLE feeling the day I saw that infiltrate. Those who say they never made a mistake are either lying or perfect.
The important thing is learning from your mistakes. It does make you a better nurse, it made me aware of how sensitive the patient population is. They can't tell you their IV site is hurting, like an adult could.
So, don't worry. You aren't the only one to have that happen to you! The important thing is to take care of yourself as much as the babies! I got totally stressed and could barely eat and sleep for a few days. That made it so much worse, get plenty of sleep, go for a run, go shopping, whatever you need to do relax!