Nightmare

When I first moved into my apartment, I had no issues. I was clean.... then out of no where I started noticing bugs. Had no idea what they were, I wasn’t getting bitten nor were my kids. We’re still not getting bitten... but today I put my son in his bed for time out and noticed another bug. I hadn’t seen any for a while so I looked closer at his whole bed, then his sisters. I found an INFESTATION of these horrid things IN THE CREASES OF THEIR BEDS. I called an exterminator and he said they were bed bugs. BED BUGS. I don’t know where they came from, or how it happened and I’m so upset!! He said it’s not from being dirty, it could be from bringing in something I owned if I had an issue elsewhere WHICH I HAVENT. Then it came to me... I bought a used toddler bed couple months ago that I tossed out because my son broke it. That’s the only thing I can think of that it’s from. The guy said they stick around even after you get rid of the source. What should I do??? 😫😫😫😭😭😭