Hi.
I'm Shilo, and I am a POAS-a-holic
*hangs head in shame*

k , seriously...
after you get your + on the opk, do you continue using them? I ask this because it is more common than you think for the body to gear up to o, giving a + on the opk, and then you DONT o.. but a few days later, another + on an opk will show up and you will ovulate then.
I think if your hpt turns out negative, that i would continue opk'ing after you get your first one, until the end of the cycle, just to make sure you arent having annovulatory cycles.
The temping SO helps with that, but I understand about trying to temp with a crazy shift.

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