Uneven big lip after fillers, is this swelling or a trout pout? (photos)

I would not worry, this is definitely swelling. Our bodies can react differently at different times so even if you don't typically swell this much, it doesn't mean that you never would. I would give it some time before making your final judgment. The bulk of your swelling should resolve in 3 days but I would still allow at least 7 days before deciding what you think. If at that point you are still unhappy, I would advise returning to your doctor and expressing your concerns. Worst case scenario, they can inject hyaluronidase, an enzyme that dissolves hyaluronic acid, to get you back to the starting point.