Are your coverlines at a similar temp from cycle to cycle?
Mine are. They vary from 96.9 to 97.1 I don't think everyone's does, though.
I've only charted 2 months but the first one was 97.87 and this month it was 97.81
Mine are pretty similar.
96.91 - Femara
97.02 - Clomid
97.07 - Chemical
97.32 - BFP
Ye'p, mine is pretty close to the same every month, too. Usually around 97.6 - 97.7.