Hi ASoulBird,
My doctor that I use for my HRT is a OB/GYN who became involved with HRT back in the 90s due to treating Trans-individuals who unfortunately had AIDS(He is also a infectious disease expert) and he wanted to do more to assist the community (Great Doctor, Wonderful Guy).
I wouldn't say it recommended to go to a OB/GYN over a endocrinologist, however if the OB/GYN has experience helping Trans individuals and is versed in Hormone Therapy for transitions then yeah I say go for it.