AF DUE TODAY--BFN

Sierra • Hi! My name is Sierra. & I`m a momma of a two year old girl (:
AF is due today and I don't even feel like it is coming. I'm not sure because I just got off the pill. Today would have been 12DPO for me.  I have slight cramps & woke up pretty nauseous. 
This has been a tough month for me as far as symptoms goes, I think I've experienced it all!! No mind games involved. However I took a test this morning and got a BFN, what should I do? I was really hoping to surprise my BF on our anniversary next week. 
And I figure with all the times I almost threw up my food or had to stay in bed due to terrible lower back pain or had to stick it out through work, that my BFP would have been here today!😔 seriously feeling so discouraged and confused.