Ovulation after chemical

New to it all. I had a chemical on our 2nd month ttc. Early chemical as my period was just 3 days late and had only vf bfps before.

Took an opk today and the line is making progress - not yet peak but heading toward it perhaps.

Usually I OV CD16 but the line is confusing me.

Any other people who had a chemical and OV on time / late / early? What is most common or expected?