26 Y.o. Looking for a Very Natural Look - Saint Cloud, MN

Well... I am finally going to do this! A little background on myself: I am 26 years old, 5'9" about 140 lbs. I've always wanted nice breasts as far back as I can remember; as a child I would put water balloons in my little swimsuit. Fast forward to high school, I was jealous of the girls developing breasts as I was still flat. My breast did develop somewhat but the left was more developed than the right. It has been a joke with my family that if anybody wins the lottery they better buy me new boobs! I am finally in the place in my life to do something for myself so I have made the decision to have a breast augmentation. First and foremost, my main goal is to correct the asymmetry but I figured while I'm at it I may as well increase in size. My top priority is achieving a very natural look. I would like to go from a 34A (that is even being a bit generous) to a 34B, I am not looking to be a C or D cup. My husband is on board although he tells me I am perfect the way God made me. I have had my consultations and feel very comfortable with my PS, she definitely understands that I want a very natural look. Now that we are within a week of my surgery I am starting to experience all sorts of emotions! One minute I am excited to finally be doing this and the next minute I am freaking myself out about the possible side effects and long term repercussions. I am a nurse on a busy Med/Surg floor so I am also concerned about going back to work and functioning at my full expected capacity (I will have 18 days off). I had my final pre-op appt yesterday and I felt comfortable when I left the office; however, this morning my main concern is that I may be going too big. We decided to do under the muscle placement with incision in the inframammary fold. I will have 235cc placed on the right side and either 215cc or 190cc on the left side (whichever achieves the best symmetry). I have officially freaked myself out that this will be too big and it won't end up with the natural look I so desperately want. Is it too late in the game to be making changes?? If I am already experiencing these emotions before surgery I am afraid what I will be like after surgery. Any words of advise would be much appreciated!!