Low grade fever 10 DPO

Emily

I’ve had light nausea, mild cramping, and hot flashes for a couple days. I had a pretty bad hot flash this morning and decided to check and had a fever of 100.6. The <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> says I’m supposed to start my period in 4 days but today is CD 36, which is the latest I normally start so idk what to believe. I took a FRER test this morning and nothing. I don’t take my BBT, but would you guys say this is a good sign?