Bed bugs!

You guys my husband has been getting this rash on his arms and back. Now that we look back it started when he moved from sleeping in the bed to sleeping on the couch (in my last stages of pregnancy). He has been on the couch ever since. Baby is 14 weeks and we just now figured out what the rash is. Bed bug bites! The only thing we can think of is we stayed in an air bnb that wasn’t the cleanest (we didn’t have anywhere else we could stay so I just went to Walmart got some cleaning supplies and cleaned the house the day we got there). We must’ve brought them home from there. Guys this was like 5 months ago! We have had bed bugs for 5 months and haven’t realized it. I checked the bed and didn’t find any but I’ve found a few in the couch. Like I said we have a 14 week old, we need to get rid of these bed bugs, but I don’t want to put any chemicals in the house that could hurt my baby. We are going to try tomorrow to take all of our clothes blankets sheets, everything that can be put in the dryer and dry it. Then lint roll and vacuum the couch, but I know that’s probably not enough. Do you have any suggestions? It’s kind of hard to have an exterminator come and for us to leave the house and just go do something for a few hours when everything is closed because of covid. I’m just so disgusted. I try so hard to keep my house clean (I’m a slight germaphobe) and this happens!