I always wait until 11 dpo. For this cycle, that was yesterday...BFN. Same for today. And no sign of AF. I'm going to keep testing! My LP is usually 11-13 days long, so I figure it's okay to test that early.
Honestly, I don't test until I'm actually late (at least a day past my longest LP). As a result, I've only tested one cycle out of the last seventeen or so.
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Re: When do you usually POAS?
I did it 11dpiui and got a BFP. My beta is this Friday.