Help!!!!!! Why is my temp still dipping?

Amber • 30 years old. We have one daughter, born on 2/10/14. TTC #2 since December 2014. Finally pregnant with #2 due 12/4/17!
I don't understand what's going on. Anyone have this before??? Please give me any insight. New to BBTing. I take my temp every morning first thing when my alarm goes off.