Ovulating late on clomid ?

Krystal

So before I was taking clomid I could get positive opks around day 15 or 16 and they would be positive multiple days in a row. We’ve been trying for over a year and my son was a clomid baby so went to the doctor and got on 50 mg clomid and he told me I should try on days 10-16 well my opks never got positive until now on day 22. Has anyone had any kind of experience like this ? What do you think is going on ?