6 weeks PO breast fat transfer and lipo. Will my lower abdomen even out and get smaller? (photos)

You are still very early in your healing phase.  The best thing at this point is to keep close communication with your plastic surgeon and follow all post operative instructions.  Best wishes. 

You are still very early out from your surgery, so I would first check with your surgeon again to make sure the swelling is not actually a collection of fluid. If it is verified that it's not a fluid collection and is indeed just swelling of your tissues I would recommend you use compression garments 24/7 and make sure you're taking it easy and not trying to do too many activities, as this is one reason you might be swelling up this much.