I have pcos and i will be going for ovarian drilling soon after five cycles of clomid (clomiphene). what is the success rate for pregnancy with this procedure?

Drilling: In your situation, your two options are ovarian drilling or gonadotropin therapy (somewhat similar to ivf therapies). These two have similar pregnancy rates - about 55% success over 6 months, although some studies show success rates as low as 20%. Gonadotropin therapy is more time intensive and more expensive, but does not require surgery. Drilling might hasten menopause- but not definitely proven.