Did clomid cause you to ovulate late?

RyRy

I have a 28 day cycle, currently on CD 15 and on second round of 50mg clomid. I’m using the clearblue digital OPK but still getting negatives. My CD13 follicular ultrasound confirmed I did have 2 large follicles so I thought I would have gotten a a positive by now. JW if the clomid may be causing me to ovulate a bit late.