boobs getting bigger

Alexis

so my boobs are getting bigger and not sure why I went to the doctor about 2 months ago and they took a blood test and it showed a negative for pregnancy and took an at home pregnancy test like 2 weeks ago and it was negative. I got my tubes tied and burned in September of 2017. I'm still having periods, I'm 26 and I thought your breast stop growing before then. not complaining, i actually love it but what do you think it could be?