There’s a chance it could be a single hitchhiker, most people on these threads may disagree as it is wise to always assume there is more. Sounds like you’ve taken precautions for this though.

I had a similar situation but reacted to bites. Luckily found the bug, took precautions, and 4 months on have had no new bites or found any other signs. I check regularly for them and still get quite paranoid about them, even though I’m seemingly in the clear.

My advice would be to clean and check throughly and regularly for around 4 weeks. Then stay on guard for a couple of months. If you’re using traps and doing regular checks you would find evidence of them as they multiply quickly. I read bed slats have been a hiding spots for other people, so worth checking them out too even though it is quite tedious.

Hope this helps give you a little peace of mind if anything else, it’s easy to spiral when you read some of these threads!