Bugs don't get resistent, if you keep up with the dewormers and don't give them a chance to multiply. What some call "resistence" is the bugs multiplying when they go off the dewormers, so they end up with more of them and don't get the initial load down. That's why the maintenance dewormer every 3 days (every 3 days won't allow them to multiply) once you get the main infestation gone.
Eggs are behind the stones in the liver, some of them hatch, but if you keep up with the dewormer, they won't get to be old enough to reproduce before they get killed off. I had my best results with Barefoot's dewormer. They probably do travel, but the dewormers will get them. It's the time element that gets to a person when they travel this road, but keep on coming back and we'll be here for you. With many this takes lots of time, but stay reassured you will get them, eventually.