OPK enquiry

SJ • 29, married, stage one endo & hubby low morphology. TTC 2 years. One m/c at 11w5d. Currently pregnant and due March.
Hi ladies,
So I know this isn't a positive (getting closer, though) but I'm starting to get concerned about my late ovulation (today is CD 17).  Should I be concerned?  I had my Mirena IUD removed in August, so I know my body is probably still regulating my hormones.  Please help ease my mind!