I will be graduating in May and am starting to look at jobs. I've heard many people say new grads should start out in med-surg, but I don't know that that is what I want to do. Is it a bad idea for me to start out in OBGYN, where I really want to work?
If you can get on, take what you want. There will certainly be surgery and post-op care involved in OBGYN, and you will develop and use many of the same skills. Med-surg is a good starting point for many people, but I see no issue with you pursuing OBGYN.
If you could possibly find a hospital that's willing to teach new grads in med/surg, ER, ICU, etc, take it. As a new grad, I personally wouldn't take OB right off the bat without proper teaching. What they teach you in school is very basic BUT if you can land it then go for it. Med/surg and ER are both great experience to start off.