Implants Don't Seem Big Enough! Will They Eventually Get Bigger?

I am 3 weeks post op with saline filled to 440cc implants from an a cup. I have waited 10 long years for these and couldn't express more to my PS that I wanted d cups with multiple photos to show him! I have heard of dropping and fluffing, but is this really true? It seems the swelling is gone and no more pain but they still can feel a little tight. I just really don't want to be unhappy with these as I have waited do long to get them and don't have more money to get them done again to go bigger