If I had more than 3-4 painful ones in an hour, and laying down and drinking water didn't help, I would call. Or if you just feel you need to. But, in this case I wouldn't have called either. Sounds pretty normal, and pretty similar to the way mine are right now, too.
I get these all the time - mostly when I'm walking. I don't know that I'd say they are painful, but they are uncomfortable enough that it can stop me from talking or walking for a few seconds. I did talk to the doctor about it and she said it's totally normal. It's only when they start coming at regular intervals should I consider them to be real labor.