OPK confusion

Adele • Trying to conceive baby #1 ☺️

Ladies! I’m so lost. I’ve been using OPK this month and 3 apps have told me I’m supposed to ovulate between the last 3 days and today. When testing my OPKs every morning they keep turning up negative!!! Should I be concerned that I’m not ovulating. I’ve gotten off birthday control in October 2018 (was on lolo, didn’t get my period). I’m trying to figure out why the heck I’m not getting a positive Opk.