I'm on CD 17 and still no positive OPK! 😳

Chelsea • TTC over 3 years with 3 misscarraiges. Currently undergoing fertility treatments.
So I'm took 100mg of Clomid cycle days 5-9 and the doctor said I'm supposed to ovulate 6-10 days later. Well I'm coming up on day 9 which will be CD 18 and still no positive OPK!! Anyone experience anything similar?