progesterone supplements

Kittu
Hello everyone .. I got ewcm in cd 17. Positive opk on cd 17 and 18 . I started taking progesterone supplements from cd 18 night . Will there be my chances that I would not ovulated . I just read in many forums that we should supplements 4 days after ovulation. I m upset now . Is there anyway to confirm I ovulated? Did anyone have such an experience before ? Please help me !!!$