bbt lower than normal I know someone of you ladies saw my chart that I posted and my temps are above…

bbt lower than normal

I know someone of you ladies saw my chart that I posted and my temps are above coverline and constant. My question is cam anyone tell me why its so low compared to my normal temps? Usually I O around 98.0 and temps go up to 98.5 to 98.6 but this time i Od at 97.88 and the highest i been was 98.45