M.R.
Is it a clear, sticky fluid coming from the nipple? If so, that's colostrum and completely normal.
Freaked me out the first time it happened to me, too!
Just wait til after you have the baby. I remember after my milk came in, I would wake up in the morning and find my t-shirt a wet mess from laying on my side which pressed on the breast, pushing out the milk from the night. Some people have even had spraying while in the shower.