another BBT question

Brandi • My name is Brandi and my fiancé`s name is Joe. I`m 23 he`s 25. TTC baby #1. I`m a hair stylist and he`s in flooring.
Sorry for being annoying with these. I started tracking my BBT a few days ago. I know now you take it in the morning and no ther time. Is my temp dropping normal?!?! It was right around the same for 3 days and then today it dropped.