Angélique, this is truly one of those things that will not be rushed without surgery. I was underwhelmed at months 4-6 and figured I would be getting augmentation sooner than later. Every one of my sisters at 2+ years told me HOLD OFF! They all urged patience and I am gladly a yielding to their advice. Month 6 to 12 has produced a 1" drop in band size and a full cup in development. Something to consider, breast development is not linear, but comes in bursts and spurts.
Naomi, mine have been sensitive and hurting for 8 months solid. Some days are work than others, but the pain is there always. I have had two exams thinking something is wrong. Finally, my endo told me to stop worrying. It is just a sign that things are moving along. It never hurts to have a chat with your doctor, regardless.