Tired, crazy, or pregnant?

My husband and I have been trying to get pregnant for several months now. I had my last period a couple weeks ago, but it wasn't normal. The flow was lighter than usual and the coloring wasn't typical either. The last few days I have been so fatigued and I've had constant dull headaches. I could just sleep all day if I didn't need to cook and my messy house wasn't screaming at me. I'm acting strangely. Today I ate a whole avocado and an entire can of olives like I was starving. I have read that it is possible to have something similar to a period during the first weeks/months of pregnancy. Am I being paranoid or just getting my hopes up a little too much? Would I be jumping the gun in buying a pregnancy test? Maybe I'm just coming down with a cold or something, but I wanted to see what someone else had to say.