Bubbles or no bubbles is not a sign of fermentation. You'll want to trust your hydrometer. If you don't have one, get one. You'll find that the majority of the posters on here will leave their wort in the primary for up to 4 weeks and completely skip the secondary. A lot of them will only use the secondary for adding additional flavors (coffee, chocolate, dry hopping, etc). Most of the directions that you'll get with kits and be followed to the T, but they can also be ignored completely. Unless you have a pressing need for your primary, you can just leave your wort in it for however many weeks you feel comfortable with (with in reason). But always use your hydrometer to determine when it is completely done fermenting (read 3 days in a row. if you get consistent readings without change, you're good to go).