Temping driving me nuts

Sive
Started temping this month my temp has been fluctuating between 35.2 to 35.8 I'm on cd 15 and I'm on 35.2 it hasn't risen at all, using cbfm and I've been getting highs since cd 8 but no peak and to top it off the stick I used yesterday on cd 14, I think it was a dud ,,