How often do you apply the Advantix?Why do you think the ticks are laying eggs?
The problem then is that you took a break.
Ticks are in the environment from the time the snow melts until it falls again, and taking a break from January until May means that your dog spent a good portion of the spring with no tick repellent on...that is why she had ticks on her.
To keep your dog tick-free, you need to keep up with the tick protection.
As for the tick eggs that you're seeing...it's more likely that you're seeing little seed ticks (immature ticks) rather than eggs. Ticks don't generally lay eggs on dogs, they prefer to crawl off to a secret spot where they can lay their eggs without worrying that a predator is going to eat them.
Now that you're using the Advantix again, that will take care of the ticks on your dog, and will likely keep her from bringing them into your house. I'd go ahead and use the carpet powder another time or two, but it's unlikely that the ticks laid eggs in your home.
No...it's more likely that your dog walked through a patch of immature ticks while outside and then brought them in on the fur. If you'd had tick eggs in your house...you'd have several THOUSAND, not a handful of little ticks...not likely something you'd just miss.
It's common practice for engorged female ticks to crawl off and lay eggs in a secluded place..under logs, in the litter of leaves on the floor of the woods, places like that.
I live in northern MN and we have ticks everywhere...including in the city...and I've never, ever heard of anyone having tick eggs in their houses. It's just not a good climate for ticks to live in. It's too warm. It's too humid. Outside is generally better for them.
No, if she was engorged in your bedroom, it's likely that she had just fallen off your dog and was just working her way towards the outside.
Canada! I can almost walk there from here!!