I had Restylane done 2 weeks ago. Although the doctor said it doesn't add any volume, it did. Could this be swelling?

Happy to hear you have this nice result. After two weeks, most of it will last! Restylane skinboosters are brought to the market to improve skin quality without adding volume or strength but in fact, it is just the same NASHA gel as the fillers, but in smaller particles.  It is a 'miniature filler', so don't be surprised when it fills or strengthens. 

Thank you for sharing your question. Restylane actually does
add volume to the area where it is injected! At the two-week mark, most of the
swelling should be resolved, although you may still be experiencing some swelling.
It sounds like you have a great result! Enjoy! Best, Dr. Griffiths