I don't "chart" per say, but have in the past. I BBT randomly t/o the month and try to see when I O'd based on that. But my shift really is not that dramatic. High 96's before O and low 97's after. Sometimes I have that "ambiguous" temp b/c they are so close.
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Re: How dramatic is your temp shift?
My CHART
I know.....I just try to keep it simple and not over obsess. I did chart before DD, but after I found a pattern, I just tried to FWP around the time I usually O'd. It was easier when I worked and got up at same time every am. Now with DD it varies, and I don't sleep as well (wake up a lot) so I temp when I can, when I feel like it might be more accurate, and around AF and O. I give you ladies a lot of credit who do it consistently every month, it is a PITA!!