I've had small cysts on my ovaries before, and it hurts like heck when (if ) they pop.
Like everyone else said, its not out of the ordinary to have them, so its probably nothing to really fret over. If you spike a fever and/or have a sharp, stabby-pinchy kind of pain on either side of your uterus, call your OBGYN, but other than that, don't stress over it.