Ovidrel shot

I finished my first (5 day) cycle of clomid. Went back to the dr and had blood work and ultrasound down to confirm it worked (open follicles). Got confirmation everything looks good so now I can (tomorrow) give myself a "trigger" shot of Ovidrel. Dr said shot forces ovulation within 12-36 hrs.  Just wondering if anyone has experience w/ Ovidrel.