No sign of AF.. What's goin on?

Kristin • 18 years young⚓️ Mommy to the most amazing lil man.☺️ In love with my best friend.
So there's 2 days left of this month it's officially the end of 2014. I still haven't started AF and don't feel like she's coming on at all.. Tested last week and got bfn. Now I'm lost. I feel like I could be pregnant but then again I don't.. Really confused about what's up with my body right now..