Yup sounds like labour to me, exactly like mine. Hate the term prelabour, labour is labour, sounds like things are getting started. To be honest if it was me I would ask DH not to go today or at very least make sure you have someone with you all day. Remember you shouldn't drive yourself anywhere.
Try getting in the bath for an hour or so, keep topping up with hot water (not too hot though).
Good luck, how exciting, a new baby