OPK question

Hi!

I have been doing the whole opk per on a stick thing.

I have been checking since last week (have spent over $60 on these OPKS) lol and nothing.

All of a sudden on Tuesday morning I had a positive opk where the line was waaaay darker than the other one. Checked that same night and just one line.

Did the BD Wednesday morning at around 4 am and then tested that same morning at around 8 am and had a positive opk.

I checked last night and had a 1 line, same as the day before.

So I figured I had ovulated.

Then I just checked right now and

First line is dark again. Why does it only come out positive in the morning?

Have I been ovulating all this time? Am I still ovulating. We baby danced Sunday AM and Wednesday AM.

Anybody??