“my ob gyn will be a female.”
You are free to choose whoever you feel will offer you the best treatment for whatever situation you may find yourself in, whether it is the ob/gyn, the internist or the podiatrist. You should never need these professionals for anything other than routine care.
“Is that the heter for a male OB/GYN?”
If a female ob/gyn needs this heter to treat a male patient, I think she should call a shrink, not a rav.