J.S.
I have an irrational fear of spiders but the spiders in my house? Yeah, we have an agreement. I leave them alone as long as they leave me alone. If they come anywhere near me or my food, it's the vacuum. I make no promises to the spiders about my cats.
Because the fact is that no matter where you are anywhere in the world, you're within 6-12 feet of a spider. They're good pest controllers themselves, which is partly why I have this, ah, agreement with them.
However, roaches are evil and if you saw one roach then there are probably a hundred/s more. If you ever look around and see "dirt" that's not really dirt but looks like tiny little dirt balls, that's their eggs. And you really need an exterminator for the little f*ers because they WILL go into the house and eat any kind of food left around. They'll even eat the glue on wallpaper and contact paper in kitchen drawers and kitchen cabinets. They can live off of a missed, miniscule spot of grease for months.
So yes, get in touch with an exterminator. For the roaches.