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BBT Chart confusion!!!

Amanda • Mon, Oct 27

Hi everyone! I am new to charting. I take my temperature at the same time every morning but I noticed that last couple days I have had a big spike then a big dip. Does this mean I'm out this month? My cycles range from 33 to 55 days. I started taking Vitex this month as well hoping to regulate my cycle. Any help or advice would be more than appreciated.