Hi Steph. Im 7 weeks post op, I had 325cc in both breasts under the muscle. I was also afraid of this because of my small frame but to be perfectly honest with you, I don’t even feel them. They are not heavy at all, maby it’s just me but I really feel no difference that what I had before (deflated A). I don’t think implants weight the same as actual breast tissue and fat. Good luck with you’re op on the 7th, and I wish you happy healing. Keep us updated after the op, and let me know how you find the weight of you’re implants. ?