I can't look at your chart at the moment, but it is definitely possible to get a positive after a negative at 12DPO, especially if you didn't use FMU. I know someone who got a negative at 13DPO and a positive at 14DPO. Good luck!
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The link to your chart didn't work for me. ...but yes, 12 dpo can be too soon, especially if you didn't use first morning urine. Just because it says it "CAN" work 5 days before your expected period doesn't mean that it is 100% accurate at that time. A test done first thing in the morning, after your period was supposed to have come, will be the most accurate. You can test sooner, you just might not have enough hormone in your urine yet, and would get a false negative. Good luck!
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