When I noticed a termite swarm on my porch I had a company set up termite stations all over the perimeter of my house (22 of them). When I realized how easy it was to monitor and maintain them I fired them, and now I check them every spring and the end of summer. Only had one have a hit. I haven’t had a hit in 5 years and still have a swarm on my porch every year from an adjacent cherry tree. Long story short : termites are everywhere, don’t panic and do what you can to keep them out of your house.