BODY HEAT & PERIOD/PREGNANCY? VERY INTERESTING

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So, I went to get a wax today. The lady asked if I'm about to start my period but my period isnt for another 7 days and I was like how did you know? She said something that was verrrry interesting. She said your body temperature rises when you are nearing your period so it takes longer for the wax to cool down & I was like hm.. I've been TTC, but I didn't know that your pelvis/bikini area tends to be warmer once you near your period or is pregnant . Does body temperature play a factor in early pregnancy or periods? I felt myself down there and i am definitely warm, but my period isnt for another week so ... we'll see! Does anybody else know what this means? Does it go back to normal once you start?