No positive (or even close) opk

Heather • 👼 7/19 👼 5/20 🌈👶4/21

For the past year I have always had my peak opk on cd 13 or 14 even after my miscarriage last July. But this month I haven’t even had a high opk. Should I be concerned?

I’m 24 no big change in life or stress or eating. I haven’t been sick or anything