BBT BELOW 97 FREQUENTLY

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Hey all! I am new to this whole charting thing, and have just recently been really focused on TTC. I do have PCOS so I have had to take birth control to get a period back as I usually only get one every 3 to 4 months) then provera than ferma. While on birth control my temps were above 97, now I'm lucky if I even hit that. Has anyone else experienced this? Or have insight on if its normal to have temps below 97?