If you only used diatomaceous earth (DE) last week you can be certain that you still have fleas in your home and on your pets.
As you also used Frontline and Paradyne on the dog and cats, you can be relatively sure fleas will not survive on them. In this case you are breaking the fleas life cycle, female fleas need to have a blood meal in order to breed. If they try to get that meal from one of your treated pets, they will die and the life cycle will be broken. You may want to continue this treatment for few months, if not indefinitely.
DE is only effective on adult fleas at any given time only about 5% of the fleas in your home are adults. There some health concerns with DE, so repeated applications and removal is the recommend path to control fleas.
To effectively control fleas with DE requires multiple applications, treatments and cleaning. There is a detailed write up about at Die Fleas! Die! Die! Die! Freaky Cheap Flea Control
Fleas can feed from the humans in the house, keeping yourself, clothing and bedding clean should control their ability to complete a life cycle using human blood.
Flea control, does not mean total extermination. There will always be some risk of fleas re-establishing themselves in your home.
You indicate you dog is still scratching, we have an answer indicating pets can have allergic reactions lasting weeks or months after the fleas are gone., if this is the case you may want visit a vet for diagnosis and treatment. Related Question What could cause my dog to bite/pull her own hair out?