Breast development help please?

I started my period when I was 10. I got normal puberty hair growth,sex drive, perspiration, and crazy emotions. What I seemed to be lacking is breast. There growing now but im not sure if im done or still growing. They only started growing in the past 6 months I'd say so im leary that there done. Im 15 1/2 so im leary that there done but then again breast development 5 years after my first period seems a bit abnormal so im not sure. Can anyone help me?