Ovulation pains but negative OPK?

THE Brittany 🦄 • Railroad Wife 🚂 Mommy to Ava Grace (11/28/15) Colton David (3/15/19) #3 (our angel 👼🏻) and #4 Layla Rose (10/28/21)

is that normal? Usually when I get the cramps, my OPK coincides with them. But not this month. 😞