Wet summer = more fleas than usual.

Fleas can live up to 3 months by biting humans, but they cannot reproduce. Fleas will not live on a pet being fed flea "medication" but they will hitch a ride inside and lay eggs that... you get the pic.

From my experience, as said above, pro spraying (with you and the varmints out of the house for 24 hours... I would not stay no matter what the pest control company says) and then, yes, sadly, flea collars until fall. I know, I know, but the collars work far better than the pills when it's a wet summer. I didn't make the rules, I just don't like scratching.