Bilateral expanders and filling

Isn't that funny my evil side is the one that causes me the least trouble... In regard to size - I have not worked out how they convert mils to cup size??? I was a 14d before and am a size 10-12 in clothes ant the PS is recommending 550 - I am 350 now and it has only been in the last few days I have noticed the volume dropping so that the wrinkles across the middle are filling out... It is still sitting high but there is a more rounded shape now ... I think too that when they do the exchange the shape and position of the implant is slightly different so that impacts final cup size... If you trust your PS be guided by them As with everything on this journey there are so many variables!!!!