As you can see from my chart ive been having steady temps.. should I be worried cos other charts Ive seen are fluctuating up and down but not mine. Is it normal or could it be that I have some underlying condition?

Im using bbt thermometers with 2 decimals, took my temp straight away when my alarm rang at 6am everyday with no interrupted sleep. & yes I know I havent ovulated yet. I just need to know about the steady temps. Opinions pls? TIA