If you can time them then you'll know to go in. if you get 5 contractions in one hour that last a minute. True labor contractions hurt, it could just be the start.
I'd keep an eye on them. they'd probably send you home anyway if you went in. if they get less than 5 minutes apart you should call to see when they want you to come in. have your bags in the car or by the door just in case!