Numerous studies have addressed this question, each with its own strengths and weaknesses. From my perspective, the most useful studies are those that identify women with PCOS and follow them forward (cohort studies) to see if the risk of miscarriage is greater compared to women without PCOS. One closely followed group of women are those undergoing assisted reproductive technologies (ART), as clinics are required by law to monitor the outcomes of IVF cycles.
One of the best studies was a 2003 report by Schieve and colleagues who analyzed 62,228 pregnancies achieved with assisted reproductive technologies (ART). The authors of this study determined that the overall miscarriage rate among women with PCOS was 14.7%. This risk was no different from the average miscarriage rate of all the other groups.
While older papers suggest that the risk of miscarriage may be increased for women with PCOS, in the end it is safe to conclude that the evidence of an increased miscarriage risk is weak. And, even if the risk of miscarriage is greater, it's likely to be very small risk.
As I continue to develop this blog, I invite your questions and comments! Feel free to post them below or on the Shady Grove Fertility Facebook page.
In the end, I hope that you find this information to be comforting as you look forward to a Fertile Future.