Why my car keep overheating?

I have a 05 honda civic ex My coolant temperature been going up and down. It did it for the first time Fri night when i got off of work but o drove it the next morning and it drove just fine no problems at all. Then i drove it again Sun and had no problems again, drove it to work today no problems but when i got off of work tonight it was rising again. What could be the problem? It can't be the head gasket could it cause if it was it would be rising everytime i drove or am i wrong? I'm asking cause the head gasket is the worse case so i'm hoping it may be something small. Btw i don't know if this helps but when i get off of work at night i take the highway when i drove to work i take the back roads, that sat morning and sun evening i didn't drive on the highway either. Could that be the issue high speed?

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