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Not sure how to read this!

Emilie • Mon, Jul 13

I feel like my BBT chart is weird and not sure how to interpret it. Going only off it, I would have said i ovulated around CD 18 but I didn’t get a positive OPK until CD 22, when I got a super strong positive one (not sure if the “strength” matters but I’ve never gotten one like that before where the test line got significantly darker than the control) so I’m very confused. Any help or insights would be great!