Trying to test OPK accuracy

Jaclyn • TTC baby #1 ; married mom of 2 furbabies

So I’ve been using the top OPK since cycle day 1. I have pcos and have had trouble detecting ovulation. This month my doctor prescribed Provera to get me going. I am currently on CD28. I seem to have long cycles. However for the heck of it I purchased another cheapy OPK. The top OPK ALWAYS looks like the one pictured..every day 2-3x a day. The bottom two are new... just purchased. I used the same urine at the same time on all 3. Thoughts?