pregnancy symptoms?

For last few days I've been having cramps even though my period isn't due for a while yet, which is very weird for me. In the last day or so I've been off my food but my goodness I. Can. Smell. Everything! I could tell there was cooked chickens in the store when I first stepped in even though they are right on the other end and usually I have the worst sense of smell ever! I've been having this incredibly vivid dreams and just generally tired and headachey. Could these be pregnancy symptoms?