I think it's ok for an OB to prescribe and monitor Clomid as long as the following conditions are met:
1) 1 year of TTC or significant evidence of no O through charting
2) proper testing has been done (CD 3 bloodwork, HCG, SA)
3) proper testing does not reveal other significant problems (blocked tubes, bloodwork abnormalities, concerns about endo, etc)
4) proper monitoring during the Clomid cycle is in place including a minimum of baseline ultrasound, monitoring ultrasounds, and bloodwork.
I realize most OB's won't follow these steps, but I think that there are some out there who do.