I can recommend my Ob-Gyn highly but not sure on the English part. She speaks a little but not sure how much. However, I can give her the best recommendation there is. Her name is Dr. Lenny Cappell?n Cordero and her office is at Centro Medico Gazcue on Bolivar. Consult # 809-686-5100
It depends on what insurance you have, if any. I usually pay a couple of hundred pesos 'difference' with mine.
I suggest phoning (809 412 8212) and asking as this may have changed since my last visit earlier this year. Her receptionist is called Maribel and is very efficient and helpful. Probably doesn't speak English though.
There is also a doctor at CEDIMAT on the list of recommended doctors by US embassy. I saw him - he was good. Apparently a good surgeon as well. Cant for the life of me remember his name right this moment. If you search for us embassy recommended doctors he is one of three on the list and only listed at cedimat.