Girls, if you're doing it it is always at your own risk and it is by far and away better to have it under a doctor's supervison.
BUT be aware that your doctor handing you a prescription for Clomid and sending you on your way is NOT MONITORING. And it is not just GP's that are doing this, it's OB's and RE's too and it is happening in every country. If you have PCOS you should have ultrasound monitoring. If you are taking more than 50 mg you should have ultrasound monitoring.