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What does the flat line mean ?

Shell • Fri, Oct 06 • One beautiful 👼🏻 in heaven Charlotte Rose 6th of April 2018. Rainbow baby boy Spencer came on his sisters anniversary 6th of April 2019🌈 👶. Pot of gold Evelyn 17/7/23🙏High school sweet hearts 💕 16 years ❤️❤️ Fur Mummy to Napoleon

I've only just start charting the past few days as I've been feeling very warm and hot like it's 1009999 degrees. I just wanted to know what the flat line means. I've never charted before. Period is due on Sunday

Thanks