How can I get into OB-GYN????

I am going to be in my 2nd year of nursing school this coming fall and will graduate around May next year. I am wondering how I can get be hire by the Ob floor. I have heard that the hospital won't take any newbies on the Ob floor.
But my question is if you are new and you don't have experience, how can you ever get to work on the OB floor?
I know I will get some chances to work on the Ob floor in the coming semester but I doubt that I can get much experience from only a few weeks of clinicals.

I am just hired as a CNA in a NF, so there is no way that I can volunteer or be a CNA on the OB floor.