i have an 18 month old son that i never breastfed. last month before my period on jan. 10th, i had swollen breasts that were slightly leaking. this occured for about a week before, during, and for a couple days after. then it was gone. now, the swelling and leaking is back and they are tender. my period is due the 18th of this month. does anyone have any idea on what could be causing this?