I don't have implants, but I have had friends who have them, as well as breast re-ductions. and most all had problems breastfeeding. Of course that doesn't mean you cant, but it could be a challenge. I don't have them- but had enough issues as it was. I got infections, rashes, bleeding, etc. So if I had implants I would be even more nervous.
I would go an extra step and find a breast feeding group, consultants, post partum doula, etc. They deal with this stuff everyday and maybe will be more re-assuring then just your Dr. b/c they can help "train" your breasts and explain to you better what they have seen. We have a lot down here- wonderful help, I just don't know your area, but I would look into it. . .
Breastfeeding is a true commitment if you want to be sucessful, so don't beat your self up over it. I made it to almost 8 weeks, something is better then nothing, but now I know what to expect for next time and how to be better. . .
~ HMM :)