Ovulation changes

Allison • 26. Married for 4 years. 22mo 👦🏼. 1 angel baby 👶🏼. 🤰🏼🌈 due in Nov2018

We miscarried in December 5th- got my period January 2rd. Usually I ovulate around cd20/21..but this month I had a ton of EWCM on cd12 and some light cramping. Today cd16 I had some light tinged cm when I wiped. I started opks on cd13 and haven’t gotten a positive yet so it’s possible that I’m over thinking it but does your ovulation change after a miscarriage or do your cycles usually stay the same?