Mark BBT as "low confidence"?

Hi - I have had to sleep in a different room in my house this week (our regular mattress is not the best when my back is acting up), and I noticed that my bbt seems to be a lot lower than normal for the cycle day. This room is much cooler - is there a way to note that a bbt entry might be questionable? Or should I just not record it until I get back to my normal sleeping situation?