I have to disagree with a lot of what the second poster said. First of all, your license IS in jeopardy when you are in a situation like that, UNLESS you speak up. You speak up and tell your house supervisor, your nurse manager, or your charge nurse, that you are being put into a situation that you feel very uncomfortable and unsafe in. Now, I've always been somewhat unclear how a complaint like that gets documented, but I know that it NEEDS to be documented somehow. Perhaps you could have your own personal log book and in it, make notes of the situation on a given night, date it, note that you complained, and sign it.
Secondly, you CAN find a better job and situation, and better staffing ratios. The unfortunate thing is that it make take some research on your part, and since you only have two weeks you may not have the time to do the researching you need to do to find a good job.
DID you follow the chain of command? Did you let your immediate supervisor know how uncomfortable you were with the staffing ratios? If not, it's something you do need to do next time around because nothing is going to get done if no one complains, and furthermore, like I said, you ARE putting your license in jeopardy if you don't say something. When you don't say something, everyone assumes that you feel like you can handle the load you've been given... and with that, you assume full responsibility.