6 month old spayed 5 days ago - now pooping the floor

Hello, got my furbaby spayed 5 days ago. Initially she was a little lethargic and tired, then ate like a beast and behaved as per the norm.

I took the cone off the next day, shes not obsessively licking the wound and its healing really well.

But now shes whaling from time to time and meowing deep pitch. Yesterday i heard her whaling then came out to a chunk of puke, minutes later found another chunk. (puked out her food not liquid)

Today i come home from lunch to check up... And she whales again then drops some hard chunks of poop lol. I cleaned up they didn't even smudge.

Her behaviour is normal and energetic shes eating well and wound isn't infected... Should i be worried?

Maybe it's worth mentioning ive transitioned them (both my kitties) 2 weeks ago to a grain free brand of hard food called Ultra

My youngest kitten is 4 months is doing fine

But my spayed one is reacting

Sounds like she's constipated, and that's why she's pooping on the floor, as well as vomiting.  Maybe try adding in some canned food to their diet.  Kibble is very drying and can cause comstipation in cats, especially if they don't drink much.