boob growth?

Anyone's boobs just ever had a " growth spurt?"... before anyone jumps to the " pregnancy" comments, the growth and pain started when I wasn't having sex with anyone. They've gotten blue veins under the skin now, and obviously have grown in size. My mom and sister have bigger breasts , so I'm wondering if I'm just catching up? I'm 19 so I kinda though puberty and growth were done??