[Wallflower]

I've had the same BBT thermometer since I started charting, which has been over a year and a half.

The past two months, my temps have been really low, and this month I never did get a thermal shift on my chart. This could be because I actually did have an anovulatory cycle, but I was just wondering if maybe my thermometer isn't reliable anymore?

How long do BBT thermometers typically work well?

[Arya]

Hmmmm I changed mine after I had 6 or so days of the same temp. I'm not sure how long they last, but maybe the battery is getting worn out. If you don't trust it anymore, I would get a new one

[NutMeg76]

You should be able to just replace the battery. If you want to replace the thermometer, I suggest the BD brand, it rocks!

[Wallflower]

Thanks ladies! Forgive my ignorance, but what's the BD brand?