What Causes Breast Pain?

hi, I am having period since 9 days...my monthly period came as per scheduled after 28th days.... on 2th feb but i started having brest pain from 15th jan onwards...it was so bad that if i press them or go for jogging it become very difficult for me....I am worried about my condition...I cant see doctor now as i am on ship...and will reach some port on 15th feb only...