When can I safely lose weight after a BBL and not effect my BBL results?

I had a BBL 29 days ago. The sx was uneventful and a success. I had to gain weight before the sx (20lbs) because of previous lipo and tummy tuck left me with very little fat for the procedure. Now that the procedure is over I want to drop 15-20lbs but I do not want to effect my results. I like my new bigger bum but the added weight is still showing up in my face, arms and shoulders. How can I loose weight (cardio, weights) and when can I start? Thanks