Cramping and spotting

I'm 5 weeks and 6 days. The past few days I've had cramping on and off. I've noticed a few times that when I go to the bathroom there's a little bit of brown discharge. Not a whole lot though, just when I wipe. This is my first pregnancy and I'm a little worried. It isn't a lot of discharge or actual bleeding so I keep telling myself it's nothing to worry about. Any suggestions? Should I be worried?