Was I unfair to a buyer?

I posted a really big solid wooden piece of furniture, expecting it to be hard to sell. First response yesterday said would pickup today
Late afternoon/evening to pick it up - had to confirm they can borrow their friend’s truck. I said call me when they had a firm pickup time.
Then 4 more people msgd about it (clearly it was more in demand than I thought and likely under priced) but I’d already marked it Pending and told them so.
Today at 2pm one of the other buyers asks me if it was being picked up otherwise they can come at 4. I immediately msg’d the pending buyer asking if she’s set for pickup (which I’d meant to do anyway around lunchtime if she hadn’t checked in first). She calls me an hour later and says she can’t pickup today or tomorrow but could come Saturday (2 full days away). I said I really needed it gone as it’s taking up space while we’re trying to move house, and had to go with the first person who can collect it. She sounded disappointed but said she understood.

Msg’d the second buyer and he came immediately and took the item. If the original buyer had offered to prepay I would have held it for her but she didn’t and i didn’t suggest it. What would you folks have done? Do you keep things for a pending buyer when they significantly change the pickup time without paying? It’s also likely raining next few days which could affect people’s willingness to come and get something so big and heavy.
I still feel guilty about it but should I get over it? As a buyer would you understand my position?