No sign of AF?

Approximately 13 DPO and Af was expected between Thursday and today. Still no sign of her and I'm really not having any of my normal symptoms. No sore breasts a week prior (just sensitive nipples the last two days), no cramps just a pretty persistent back ache since 7 DPO, horrible and unusual acne, and vomiting. BFN the last 3 days. Am I out? Why would my hCG not be able to be picked up by FRER yet? Feeling pretty discouraged. 😔

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