Boob pain

Leah • L x

So recently I went to get my boobs measured and was told that my boobs are actually a DD not a C like I had been wearing. I already knew that a C wasn't right because I had been spelling out recently. So I bought some new bras and went on my way. But now I'm noticing that my boobs are really sore and tender all the time even without a bra on. I'm wondering if this is just what comes with having bigger boobs or if it's someone to worry about.