I'm 19, and lately my breast have been very sore and tender. What is it from?!

I'm 19, and lately my breast have been very sore and tender. What is it from?

i was thinking maybe it was from my period, but its not due until about 2 weeks. and they were sore last month too. if anyone knows why.. or what it could be from, let me know plz.

Additional Details

and its not from salt, i stay away from that.

could it be becuz they are still growing?? my husband said maybe thats what it is.. cuz he did notice a size difference...

It's not uncommon to have breast tenderness during PMS.
Did you get your period last month?
Are your boobs also bigger than normal?
I don't want to freak you out, but my boobs hurt SO bad a couple months ago and I thought I had PMS, but it turned out that I was pregnant!