Had bed bugs in one room, treated one room, havent got bites since, havent been in room since?

so i found a bed bug in my room(attic) and treated the whole room and havent been back in there since, i have been sleeping downstairs. its been like a month do u think its save to go back up there since they clearly didnt move around house? when i did find bed bug, i rarely ever got bites to even think i had them, got ONE bite only like once a week