When implants are first inserted, they sit high up because your tissues are tight and gravity hasn't taken effect. Over time, natural tissue expansion occurs to allow the implants to fall into place. By this time, your breasts will have taken on a more natural contour, where the lower breasts become softer and rounder. Please wait at least four months for this to happen.
Some photos of how you look at the present time would be helpful. However, you are only two weeks postop and all implants sit a bit high and look big at this timepoint. Give it several weeks for the swelling to settle completely and for everything to relax and drop, and you may find yourself very happy with the result.
It is absolutely normal to be "too high" for a few weeks after surgery. Check in with your PS to be sure you are on track, and to see what you can wear right now. If you plastic surgeon lets you wear a bra now he or she may want you to just wear something soft, without a wire. It is too early to figure out your "final size," and try to focus on How You Look (when the implants settle in) rather than What Size Bra fits you best.
Be reassured by a visit with your plastic surgeon. Best of luck!
Generally it takes 6-8 weeks (sometimes longer) for breast implants to drop. In terms of a cup size it is very difficult to predict without examining you but I would expect a C cup with your prior dimensions and the implant size.
All the best!
Dr. Tony Perkins
At one week post breast augmentation, it is way too early to see the final result. I would also wait a good six weeks before getting sized for a bra.