I just started my period yesterday. Today I noticed I was really warm and felt super tired. (Not normal for me at all.) So I took my temp it was 100 so I called my doctor to make sure it wasn't anything serious. She said I was fine to wait it out for a day and see what happens. So I take a nap and I wake up totally fine. Took my temp it was 89.6. So I get up and start doing things around the house. I started to feel really warm and a little dizzy. So I layed down and took my temp it was back up to 100. It has been up and down all day. This has never happened to me before. I'm only 24. Is it hot flashes?