Betta Fish: Is this a bubble nest?

Could this even be a bubble nest at all? The betta was added just yesterday, so I guess it could make sense — but the betta is very weak, timid, and still recovering from living in those tiny store cups.

I understand that a bubble nest isn’t an indicator of a betta’s health, but it still feels pretty strange. I’ve never seen such a large bubble nest from a betta that was just brought home.