My follicular phase BBTs have been higher this month, particularly the past couple of days. I dont think I've O'd yet because I am being monitored by my RE and using OPKs, but the last two days my BBT was a little higher. Due to the colder weather over the past few days, I have been using heavier bed covers and keeping the heat on higher in the bedroom. Could that be the cause of the higher BBT? I am just worried that I somehow missed O this month. Chat Icon