BBT spike at 11 DPO

Lisa • Married 5 years to a wonderful man. Son born 26 Jan 15. Expecting another boy in Nov 16 X
Hi ladies
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​My temp shot up this morning by 0.3c at 11 DPO
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​Is this significant or of no consequence?
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​This has never happened before.
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AF due tomorrow, took cheap eBay hpt this morning and was BFN.
Thanks