If you're far enough, that might well be happening. Some times it happens before subtancial volume development and the areola mounds pop out of nowhere. I had quite a lot of boob when it happened, but the difference was dramatic and it got strarted quickly. Interestingly, about three months after starting progesterone for the first time and weeks after starting Bovine Ovary + Uterine + Pituitary combo.
Not everybody has it as distinctive though as the development stages are not always like from a anatomy book, but typically Tanner 4 areola mounds are easy to distinguish.
And then the awesome part begins. Average duration of Tanner stage 4 is about three to five years. Some times faster, anyway, this stage likely gives most volume development and most projection. Once its further towards the end, that's when more side branching starts to happen and the areola mounds widen and become less prominent. So if this is going on, you can expect several years of active development if you just keep being consistent with the treatment.