Had unsafe sex, breasts started growing.got heavy period a week before due time.now they keep on being sore & growing. pregnancy test neg.what is it?

Hormones: If you are in oral contraceptives sometimes you may have these side effects. Discuss with your doctor i you are on one for possible different one.

Miscarriage: The heavy period could have been a miscarriage, but if that were the case, it would seem your breast tenderness and enlargement would be resolving. Get a pregnancy test -- maybe the serum one this time. I hate learning the hard way -- you just learned the hard way to not have unsafe sex! (sorry.) i hate to bring it up, but menopause is on the way. Just make sure this is not an unwanted pregnancy.