It's fine. With a vigorous healthy yeast, active fermentation can start very quickly or take longer to develop. While the yeast multiplies and burns up oxygen, eating all that maltose (malt sugar), turning it into alcohol and farting out carbon dioxide, the bubbling can be quite rapid, or just bubble at a slow pace. It's all normal.
Just because the bubbling has slowed or stopped doesn't mean the yeast is done. There's plenty of residual fermentation going on where the yeast is consuming early byproducts like fusel alcohols and diacetyl, turning them from off flavors into more interesting and drinkable esters and phelonics. It's like the yeast goes crazy eating everything it can, then comes back for seconds once the main meal is done.
Just let your beer sit a full three weeks in the primary. This is most often the hardest thing to do as a new brewer, having the patience to let it sit and rest a little longer on the yeast cake. Trust me, just let it sit. Once three weeks has passed, add 3/4 cup of corn sugar (dextrose) or 1 cup of table sugar to a cup of water and make a simple syrup out of it by dissolving it in hot water on your stove. Pour the simple syrup into your bottling bucket and rack your beer (transfer your beer) into it using a racking cane or auto-siphon. Keep the splashing minimal at this point as extra oxygen can oxidize finished beer, creating a cardboard/leather off flavor.
Once racked, fill your bottles or kegs and cap. Store them in a warm dark place in your home (shelf top in a closet, etc.) and then, have the patience to wait another three weeks or so while it fully carbonates. Yes, there will be some carbonation at one week, but it usually is very light. Three weeks of bottle conditioning is just about right, and chill your bottles for a full 24 hours before drinking to allow maximum re-absorption of CO2 back into the liquid.