This is not true. In fact, to get a PGY1 spot you would have to go through the match, or the scramble. I don't know if you can sign up for the NRMP now (in order to submit a rank list and scramble). The other thing to think about is if you really want to go to a program that ends up with a scramble spot.
You will likely need to start as a PGY1. They might give you some credit for your ob/gyn months, but likely not much, and any off service rotations you do. You should start by looking at the EM residency governing body website (not sure what this is) for requirements for going in as a PGY2 to see if this is possible.
Next I would talk to your PD and let them know they are going to have to replace you soon! Then talk to the EM PD at your hospital. This is probably the best way to get a spot for next year. Sometimes they can fit residents from other programs (but the same hospital) in somehow. They will also probably be able to help you navigate the process. It is very common to switch, and the PDs will be your best resources.
Good luck with everything!