“Should sculptra injections be painful?”

I had 1 vial of Sculptra done 5 weeks ago. The derm did not pre mix the vial 2 hours prior as I decided spur of the moment to get the treatment.

I would like to know if not pre-mixing the Sculptra powder 2 hours prior can cause problems down the road for me? I also expected it to be painful as I have heard from other patients. It was not at all painful and Im wondering if it was because it was not injected deeply enough? I did not have and prior numbing injections or cream.