Chances are?

I have now pushed back my period date multiple times this month. My cycle was just starting to regulate after my Nov 14' Lo. 
Dh and I have been having a lovely time embracing the "Not trying,not preventing" method. 
My calendar is showing that I am a little over 2 weeks past that start of my "fertile" phase and about a week late for my period. 
Does it sound like there is a chance or is my calendar messed up and I'm being way too hopeful? 
I do plan on testing tomorrow but I am just too antsy to not talk about the possibility now. 
Thank you:)