Strange hunger.

For some reason lately I've been waking up starving and even after having eaten a meal, an hour or so later I'm starving, like right now. I just ate a steak and vegetables and not even an hour after my stomach is growling and it's as if I never ate in the first place. 1 1/2 weeks this has been going on. I'm breastfeeding my 7month old daughter, no increase or decrease in supply, no dietary changes, no decreased or increased stress. I don't get it. Sometimes I wonder if it could be a sign of pregnancy but oh shit I hope not. Have any of you experienced this before? If so, why?