Is this normal for BBT?

Danielle • 30 y/o mama to a toddler and 3 cats 😻 happily married💍 to my DH since 06/08/2016, TTC baby #2

Hi everyone it’s my first month TTC and I’ve been taking my BBT for the last three days at the same time every morning. My expected day of ovulation is Jan 16th. My BBT was 36.5 on Jan 12, 36.8 on Jan 13 and now 36.01 today...is it normal for it to go up and down like this? My ovulation test strips have been very feint the last two times.

Thanks!