Getting bit once per week since June? What's the next steps?

Between my spouse, toddler and I (all share an apartment bedroom) we've had 1-3 bites show up on 1 person every single week (7-10 days apart since June. I've been logging the bites in a note. I can't find bugs anywhere in our house. Weve searched everywhere except inside the damn walls.

Would my next step be diatemacious earth inside the walls/outlets? What should I do? Im stressed.