Bedbugs

So we had a low infection.... my house got cleaned from top to bottom I took out all laundry and washed and dried it at laundry mat double bagged it put it in garage got an exterminator who did liquid spray and he comes back in another month I haven’t seen any but I also don’t know the chances of seeing them again I wasn’t home for a few days when they sprayed due to me being pregnant and now I’m just scared to sleep in bed and missing a lot of sleep has anyone had an exterminator and never seen them again ????