Missed Period, but BFN

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I have been having symptoms recently and I normally don't get symptoms during AF. (Really sore and tender breasts, nausea, food aversions, indigestion, lower back pain, light cramps that only last a minute or so, etc) but I took a Test on Monday (when Glow says AF should have came) but I got a BFN.

Any opinions?

My period has been regular.

Thanks!