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I think washing/cleaning the house well would be a good idea. I was once told that the best thing you can do to prevent/stop a flea infestation in your home is to vacuum frequently, and empty the vacuum outside of your house every time you use it.
(this will help get any live fleas/flea larvae out of the house)

If the vet only saw flea poop and no actual fleas, hopefully that means the flea medicine is working and killing the fleas (just after they left their "dirt").

If you aren't seeing a ton of fleas I wouldn't worry too much about it. It may be time to switch up flea meds though

My dog got fleas from my ILs dog last summer and I FREAKED out about it because our dog sleeps on the bed, on the couches, on us. Neither DH or I had any bites, but I first found the fleas in his groin area (as @Happygal: mentioned), as well as some flea dirt around his bum/backs of his legs. He was not on flea/tick topical at the time (you better believe he is now!)

Here's what we did that worked. I bathed him with flea bath twice (once a day I think? whatever the bottle said I could do) and then combed him and drowned any fleas I combed out in a bowl of soapy water. I did that (the combing/soapy water) about 3x a day for a week while I also vacuumed every day and washed all the bedding.

I was still finding fleas on him, although I never found any anywhere else but on him, and we decided to bite the bullet and bomb the house. We bought the kind that doesn't leave residue on things, but we still put all the dishes/food in the fridge and oven. I also dried all of his toys (he's a stuffed animal lover) on high heat in the dryer. That finally worked, and we didn't find any more fleas, although I kept combing him once a day out of paranoia for a month or two after. I think he started to like getting combed, haha.

@ladybee: I had some natural spray that my husband got at home depot that stunk like oranges that I sprayed on the couches, his dog bed, etc. I don't know if it helped, but it did make me feel like at least I was doing something I'd say get a flea comb and comb around his tail, or wherever his fur is thickest. Also wait til he's been sleeping in one spot for a while and then flip him over and check his groin area - they run away pretty fast, but I did see at least one every time I did that at the beginning before we started treating him. Good luck! Hopefully he doesn't really have fleas (or doesn't anymore)

@ladybee: this article addresses why preventatives sometimes fail: http://www.c-ville.com/the-itchy-and-scratchy-show-seriously-whats-up-with-all-the-fleas/#.U7xU95RkR8s

Do you have a flea comb, or something like the Furminator? That's how I found them.

@ladybee: In the laundry aisle at the grocery store! Its just old fashioned laundry detergent mostly. I got this brand:

http://www.20muleteamlaundry.com/

Just try to not let your pup (or LO if you have any) get it on their paws if they are a licker. Borax is pretty tame but you don't want your dog ingesting a lot of it.