Late O

So I've been freaking out this entire time that my period is about 2 weeks late and all BFN. But out of the blue 3 days ago I decided to take an opk and bam! Looks like I'm ovulating late. Now I'm trying to figure out if I'm about to ovulate or already did but seems like the lines are getting darker. What do you guys think. These are OPKS from 10/18-10/20. Is it normal to have consecutive dark lines for 3 days and are they getting darker?