Did anyone.....

I'm 11dpo, AF is due on Friday(2 days) and I tested and got a BFN. Anyone tested this early and tested later and got a BFP?
I've had a few symptoms, constant headache, overly tired, hungry all the time and breaking out like crazy! I've never gotten any of these symptoms when I get AF. 
Am I going crazy or can I really be pregnant and it not show up yet?