Was the BFP colored or grey? Did it show up within the correct time frame? I am wondering if you got an evap? Otherwise what sensitivity did the first, second, and third tests have? Did the first HPT have a higher sensitivity than the other two?Â
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A BFP is confusing to me as it really doesn't look to me like you O'd on CD 40. Your temps just don't support it. It also doesn't look to me like you have O'd after that either. Keep in mind that about 33% of women won't ovulate prior to their first pp bleed. And only half of those that do O prior to their first ppAF will have a fertile length LP that could sustain a pregancy.Â
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I would recommend waiting another few days and testing again just to verify the negative result and then wait for the next patch of fertile CF to see if you can catch an O spike.