Here in the country backed up against the woods scorpions, among other things, are a big problem. Here is a female with a back load of babies that hit my "Cyonora" barrier that I sprayed around the base of the house. I had heard this was how they did it but it was the first time I had been able to examine one up close. Once they shed the babies they have a black back. Normally their back is a brown or tan color so if you see one with a black back in your house you know you have a dozen more that you may meet some day. Keeping them out is vital but not always successful. Just part of living in the country.
If there is one in your house it doesn't mean there are hundreds more. They aren't roaches. They are looking for food. That poor scorpion was caring for her babies and then she died. All of the babies are off her back and aren't ready to come off. That is just pointless.