I had sculptura and found out I was 3 weeks pregnant a week after. Will this harm the baby?

The evidence so far is that Sculptra should not have any effect on pregnancy.  Sculptra is based off of a natural substance and stays localized after injection.  The consensus recommendation is to not have injections during pregnancy or during breast feeding.

Some types of medicines have not been properly evaluated for safety during pregnancy. It would be unfair for anyone to comment on this as there are no studies that document the safety either way. Best, Dr. Karamanoukian Los Angeles

Even tough, we don't recommend to get injections during your pregnancy, but  you should not be too worries. The product injected in the face does not migrate to other part of the body let alone to the embryo. The product has to become blood born (get into your blood stream) for it to get to the baby. And many injectors are very careful not to inject near or in the artery or vein.