What could be th cause of my breast leaking? had a my period this month on the 2nd of this month.last week i expirienced light spotting.tested yesterday for pregnancy and i tested negative.please help?

You had period three weeks ago so the spotting last week could be the ovulation and you might get conception if having sex during that time but it is too early for a urine pregnancy or test or nipple discharge. You should test again if you do not have period by the end of next week. Nipple discharge is not uncommon outside of pregnancy. If it persists after the next cycle, see your doctor by then.