Glow is telling me to wait to test....

So I know it will tell me to test tomorrow. Glow said AF was due 11/18 but it didn't come. Now it's saying 11/25. I tested 11/17 and got a BFN. Should I test tomorrow like Glow will suggest or wait when AF is due??? I don't want to be disappointed. 15 DPO tomorrow.

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