No period this month!?

Katy

As December comes to an end, I'm slightly concerned that I have not had a period this month. 😳 I've taken 4 at home tests and all of them have been very clear negatives. This has never happened, I'm wondering if anybody else has experienced this or has any input?

I was a littke stressed during finals this month lol, and after almost 8 years I quit smoking a month ago. I'm not sure if these can play a part.