I got a positive days ago on my opk, or what I thought was positive. Then the strips faded again. Then yesterday they got dark again, and today darker. Am I ovulating this time? Is this weird? The pictures below are over a span of a week...between the second and third pics, I had three days of negatives...

As dark as control-days ago

Darker than control-days ago

Had a period of VERY negative opks in between

Yesterday's darer than control again

Today's SUPER dark...

Ideas? Thoughts? First time using opks so I'm just thoroughly confused...