ovulation test question!

I’m sorry if this is a dumb question, I’m new to TTC & opk! So I started testing yesterday CD 8 it was low, I was expecting it because I JUST started my fertile window. My question is, I took a opk this morning it was wayyyy darker on the left line, now it’s lighter after testing @9PM. Is that normal? I should also add in I have endometriosis.

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