What can cause such a drastic spike? It was taken at the same time, same house, used same blanket

Question

Answer

Illness, alcohol the night before, immune response to something.

Answer

Maybe you were very hot or fighting an illness or just low grade fever? I was 99.6 this morning but today I’m supposed to be ovulating. Maybe it’s due to our fertile window? Not sure… I don’t use. Basal temp just a regular forehead digital thermometer.

What can cause such a drastic spike? It was taken at the same time, same house, used same blanket

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