OPK testing. Is this normal?

This is my first time using opks and I started testing in cycle day 11, since then, it seems like the levels are only going down. According to the calendar, I ovulate on the 14th (I know this is just a rough estimate). My cycle is 29 days and usually very regular. I’m not sure what to think of this. I’ll keep testing to see if this goes up, maybe I’m just ovulating late this cycle? I don’t know. I’d love to hear some thoughts!