How much will these change when they drop and fluff? 500cc HP saline implants, 2 days post op (Photo)

With 500 cc, you probably got a good enough sized implant. However, only time will tell if you'll be happy with the results. Wait about 4 months before judging your results. 

Thanks for your inquiry. At two days you are swollen and there are many changes to come.  500 cc is an aggressive size and you did pick a large implant.  As for your concerns about the final look of your breasts and what you hoped for you should discuss with your plastic surgeon.  Good luck with your recovery.