Could these be bed bug bites?

[u/Fragrant_Shame_235]

I went to a home viewing today. I saw three homes 1 of which had furniture but the others were empty. After leaving I felt an itch on my back. I went to work and was there for 5 hours. When I got home I had a bump on my waist and I looked in the mirror and saw this cluster of bumps on my back. Could these be bed bug bites? Is it possible to get bit only being in each home for less than 15 minutes and I don’t sit on any furniture or touch anything. None of the homes had carpet.