I would try to go straight to OB if it's an option and you know that's where you want to be. The job market is pretty bad for new grads in every specialty so take what you can get, of course, but I wouldn't force yourself to do med-surge if you don't need to or want to.
I never worked a day of med-surg and don't feel that limited me in any way. No, I wouldn't be able to place or use an NG tube without looking up policies and asking questions to guide me first. But that doesn't really matter, because I've never had a patient with an NG tube! A lot of the time, med-surg does exactly nothing to prepare you for what it's like to care for two patients in one body, one of whom you can't see or evaluate except for ONE vital sign (heart rate). While I highly respect and value med-surg nurses and all of their knowledge, a lot of what you do in med-surg has very little relevance in OB (and vice versa).
Good luck, I hope you're able to get your foot in the door in OB through a preceptorship. It's an amazing place to work!