New head gasket

I have a 2005 uplander. I have had the water pump, thermostat, head gasket, temp sensor, radiator replaced recently. Today as Im idling, my temp guage moves slightly to the right. Then when I pulled off it went back to half. This is the first time its done this. What could be wrong? Im a little anxious because of having so many overheating problems in the past

When you are idling and you temp goes past normal, is your radiator fan coming on when you are not in A/C or defrost mode?