Concerned

Carol • Hoping to give our 2 yr old daughter a sibling 💗💙

I’ve been taking the digital OPK since Sunday 8/7… I am due to ovulate in or around 4 days and the test keeps showing low fertility. Could there be something wrong with the test or could I be late in ovulating, or could I not be ovulating?! Picture in comments. And also I want to add that I am very regular and my period always comes on or the day after it’s supposed to arrive.