How old are you? It is very common for people to have breasts that are two different sizes or assymetrical. Mine grew that way when I wasn't on b/c. Most likely it's just the way they are and not the meds.

Hi leah, my daughter who is 18 has always had one breast a bit bigger than the other she new it was like that but never really paid much attention to it or it never bothered her.. She was checked also and the doc said everything is fine completely normal. When she was put on birth control her breast size increased dramatically (made me jealous) and then is when she really started noticing the difference from one to the other. So I think its just the fact that the breasts have gotton larger due to the birth control so now its more noticeable. But if you saw your doc and he said everything is normal then dont worry about it he would know if it was something else. Alot of woman are that way..

I noticed a difference in size when I was younger.. They've sort of balanced out since then even though there had not be a significant change in size. Most women do have one bigger than the other... You're feet probably aren't exactly the same size either

One of mine is also bigger than the other. It is normal. Maybe you just didn't notice before because they were smaller. B/c can cause them to get a little bigger. They also get bigger when you gain weight.