I can't address how your surgeon prepared you for surgery without knowing his routine and how he discusses the risks of surgery, but most surgeons in the US do this with meticulous attention to be sure that patients understand those risks and consent to proceed in spite of them. Scarring is a known risk of surgery, and as surgeons, we can't control how your body chooses to heal. We can do the surgery using techniques that are less likely to cause significant scarring, and again, I can't comment since I don't know who did your surgery.
That said, you should meet with your surgeon now to discuss your concern, as there are options to manage thickening under the areola (Kenalog or other corticosteroid injections can reduce the thick scars in that area). This is something that I do routinely in patients, perhaps as many as 5-8% of patients, where this is needed. I consider this as early as 2 to 3 months post-op, so your timing is reasonable, presuming your surgeon is comfortable with this option.
Good luck.