I'm not convinced you O'd yet... CD 13 would be a little early for you based of your previous cycles. Are you doing anything different this cycle (on supplements, recent weight change)? If not, I wouldn't think you'd O early this time, especially with no + OPK and no fertile CM yet. This could just be a random pattern in your temps.
Keep doing OPK's and BD everyday in case you O soon! You never know though, that could've been it!
Looks like your cycles are shortening up since the chemical a couple months ago too. Mine did the same thing after a chemical I had a few years ago. It actually regulated the beginning part of my cycle. Hopefully that helps you get your BFP quickly!! :)
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