Weird opk test results!

So I’m really confused.. for the most part I’ve been getting very negative ovulation tests I finally started getting dark lines 4 days ago they stayed the same color until yesterday but they’d never been that dark since I started so I assumed I would ovulate today or tomorrow but I just tested and I got such a FAINT line!): I’m so confused! Do the darker lines mean anything even though they’re not as dark as the control line? Advice? Anything helps!