Side note - it could be a sugar issue, so yes, as pameladawn mentioned, you should bring it up to your Dr, just in case!
I haven't experienced the extreme hunger, but I do have to keep something in my stomach pretty constantly or the nausea overwhelms me. Instead of just the crackers (which help with the stomach acid but doesn't really supply anything nutritional to you), try carrying around a baggie of grapes and/or baby carrots. Beef Jerky is another good one because it's high protein and low fat - just try to get a low sodium one because it is LOADED with salt - but I found it to help because I could pretty much nibble all day without actually 'eating'. Hope you feel better real soon!
With my last pregnancy I was hungry all the time and it was a boy ;) I just always made sure every two hours I was eating something. Good LucK!
I'm 10w2d and for the past week or two I've been hungry almost all day, everyday. But never to that point, maybe just ask your doctor about it?