Still a chance at 12/13DPO with BFN?

My last period started on the 30th of Dec, on CD 35, with a full on chemical...in January I ovulated on the 15th or 16th (had positive opks for 48h). This should mean that tomorrow or the day after, AF should show up and I have BFNs on the sensitive pregnancy tests. Last time I started testing positive with faint lines at 15-16DPO on the sensitive tests, but since it ended up in chemical, not sure it was ok given the slow evolution in HCG.

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