I'm only 3 weeks post op and my breasts are already sagging. I have no cleavage and no roundness on top. What can I do? (Photo)

I finally had a Breast lift and Breast Implants I have silicone had 375cc implants. My doctor only went through my Nipples he did not inform me until after I woke up from my surgery I feel that they are already sagging and I am unhappy with the lack of roundness on the top and lack of cleavage, and dispoportionate nipples. I wanted them to look very perky in perfectly round When i lie down they separate to a width gap become flatter and the gap widen My breasts are too lose and soft, help plz