Common House Bugs

I just had my house sprayed by Orkin and my man now I see more bugs than I saw before he sprayed. Is this common and will eventually stop once they start to die from the spray or should I be concerned about the spray does not work?

When the house is sprayed, they generally use low insecticide, so it does not kill you too. (Bad for Business)

Thus, the action takes place over several days. The bugs should disappear and die, we hope a very long dead, and not come back 'til next year to mourn their ancestors.