For more information visit the NH COVID-19 Response Page
https://www.nh.gov/covid19/
Quarantine Guide for Unvaccinated People Exposed to COVID-19 in their Household
If you are unvaccinated and have been identified as a household contact to someone diagnosed with COVID-19, then you are at risk of developing COVID-19 in the 14 days after you were exposed, and you should follow these instructions. Household Contact: any individual who lives and sleeps in the same indoor shared space as another person diagnosed with COVID-19 (either a temporary or permanent living arrangement), leading to close contact and potential repeated exposure to the person with COVID-19. This includes situations where there may be temporary but prolonged exposure such as sleep-over events, shared camp cabins, vacation rentals, etc. Here is a link that will take you to a more detailed description of this.
Self-Observation Guide for People Exposed to COVID-19 Who Are Not Required to Quarantine
If you were in close contact* with someone with COVID-19 in the community (non-household contact), you should follow the instructions below. If you are a household close contact** to someone with COVID-19 but you are fully vaccinated, you should also follow these instructions. Here is a link that gives more details about this.