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How do you chart a missed period?

Jennifer • Married to my best friend 💕 Chemical engineer 👩‍🔬 SMD 12/11/2019 , expecting #2 January 2021

So I had a normal period on August 3rd my period was supposed to come September 1st but I'm pretty sure according to my BBT I am skipping a month. How would you chart this? From expected date or from major drop in BBT? Otherwise I'm 18 days late on CD 43, no AF and no BFP with very low temps.

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