One day until AF and negative?

On this app it says I should start AF tomorrow, on another that I used last month says I should start AF Wednesday. I took a test today and BFN. :( I'm trying not to get bummed out but I've been trying for months now after a miscarriage. I even tried extra hard this month. lol. Could I be testing to soon? If I start tomorrow shouldn't I surely have shown a positive by now? Anyone have a negative one day and a positive the next? 

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