Hi im 18 and I have sore breasts which also feel slightly bigger..my nipples are also slightly bigger and I have dark blue veins around my breast and nipples. I have been getting light pains/cramps in my abdomen (but not everyday) and it also feels slightly harder. I am due on my period in 9 days but I have been experiencing these symptoms for 13 - 14 days now. Also I had sharp pains in my belly/abdomen around 3 days ago. I am not taking any birth control. What could this be?