I would continue to monitor it and track your hormone levels over your next few doctor visits. If there is something physically wrong causing it you'll catch it in your tests, I would think. You could also try doing things to stimulate the area like tissue massage, a lot of girls swear by it. I can tell you that during my time experimenting with supplements I I had a similar feeling; I I experienced a budding pain/itching and a full, weighty feeling in my chest that lasted for close to two months and then just sort of went away shortly before I stopped taking the supplements to prepare for HRT. I'm well aware that it's far easier said than done, but try to put it out of your mind and just let nature work its course.
