Breast Augmentation Before and After Natrelle 550 silicone

I have been using this site for a while now, and all of you ladies and your stories have helped me soooo much. I have wanted to have this surgery since I was 12!! When I was growing up my best friend at the time and I made a promise to each other way way back in middle school to get breast implants if our boobs never developed. Well neither of us did and she ended up getting her boobs done years ago. I have been pretty nervous about the whole thing, but finally I am ready to get what I want!! Woooohoo! My boyfriend tried to talk me out of it back in November but he totally supports my decision. I think he just wanted to make sure I thought about it thoroughly, and made a good choice. I love that man!! Sooo yea I am a pretty hollow 34/36 A/B (depending), 5'5, and 138lbs currently. I really want to see an increase to a full 34/36 D. I believe I will be getting Allergan's Natelle 410 silicone cohesive gel implants, but I am not sure what cc I will end up with. I want anatomically shaped implants for sure, maybe high profile, not totally sure yet.. Any suggestions!?

So I went to my pre op appointment today, and it looks as though I am going with a 550cc round silicone cohesive gel implant by natrelle. I am hoping to end up as a 34/36 D, but a DD would be great. The doctor said that I would get the best results with the round cohesive gel silicone instead of the form stable "gummy bear" implants as I do not have a lot of tissue to start with. I am getting very excited!! I am however feeling super nervous and my older sister really started freaking me out. She said I should not ever do silicone and may end up with an autoimmune issue because of the toxicity from the silicone. I am pretty lost on this as the saline implants also use a silicone casing. Does anyone have any information on this? Or does anyone have any experience getting autoimmune issues after getting silicone implants? Anything you have to say to ease my fears would be great!
Thanks, I'll update ya'll tomorrow with post op photos and stories!!

Does anyone have experience with the ultra high profile silocone gel implants? My doc recommended a 550 cc uhp and I'm worried they will be too big... I want to go from a 34/36 A to a 34/36 D ideally :) and the big day is tomorrow!! I can't wait for 11 o'clock to get here already!!