BBT and periods

Lizz

Hello everyone! I’m one month into ttc. I’ve found that <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> can be a little tricky when just starting out. I’m doing ovulation tests and I just started using a bbt yesterday. The bbt charting seems a little

Confusing to me so any tips would be great. Yesterday my bbt was 98.07 and then this morning is was 98.04 so going down. To my understanding your bbt should be lower when starting your period but I started my period today. Is it normal that my bbt is 98.04 and I started my period today? Thanks in advance!