18& hot flashes!!

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Ugh! So I took so many tests and got negative everytime! I got what I'm sure was my period on Monday(heavy) then Tuesday is wasn't as bad, and yesterday it was gone! The last few days I've been feeling so sick and been dealing with hot flashes and insomnia. Going to get blood work done tomorrow but I'm just curious if anyone experience something similar and been pregnant? Or just hot flashes while being pregnant