Dayna - I'm another who had sensitivity in the first week (by day 5). I could fill a 42A by the end of that week, but I think most of that was pre-HRT gynecomastia perking up and out once the breast buds formed underneath. I had to buy new bras constantly, b/c I was a C-cup by three months. I am currently 42DDD in my favorite Lane Bryant T-shirt bra (about 3.5 years on low dose estrogen only). And that one is starting to feel tight again... frankly, I'd be happy if it stopped somewhere around here. Anyway, yeah, you're not the only one to see breast soreness/growth very early on, and most of the women I know for whom that happened have also ended up pretty big. 🙂 It seems like it might indicate high estrogen sensitivity or something.
As for the original question, the soreness has been off and on but hasn't quit so far. Sorry!