I found ~30 baby spiders scattered across my bathroom ceiling/venturing into the adjacent room after coming home from a weekend trip. I vacuumed those up and sprayed the 2 rooms with pesticide. I’m worried about what to do next because I haven’t found the nest anywhere and online pictures seem to imply there should be many more spiders.

My best guess is that they came from a vent on the ceiling, because they’ve all been on the ceiling so far and its been many months since I’ve used the HVAC. I think I might just wipe all of the vent covers down with the pesticide… How worried should I be? Is there anything else I could do to keep them from spreading into my home? My partner is against harsh chemicals so I’m trying to avoid dousing the entire home.