Does this look like a termite?
It looks like a termite to me, The body is thick all the way back. Ants have a narrow body in the center. Make sure to check around your foundation and look for evidence especially where the dirt is close to the wood. It is possible that a swarm just arrived and that one came into the house through a door or window. With Termites and Carpenter ants it is best to be proactive because they can do a lot of damage in a short period of time. If you are not able to do the inspection under the house it might be worthwhile to hire a pest control company to do the inspection.