Help sharp pain!

Nicole
So I'm 9 DPO and I have a sharp pain in the lower left part of my abdomen. It doesn't feel like a normal AF cramp (due in 6 days). I've also been insanely tired. Got off BC 3 months ago so not sure if this pain and feeling is just my body getting bak to normal or period symtoms or maybe it's implantation?? Thoughts!??? 
Ps. Took a pregnancy test this morning even though it's early n was BFN. Help!