Leaking nipples

Dawna
My period is due in 3 days. And breasts are a lil tender. But nothing unusual.  Today in the shower I was washing up and noticed the my right nipple was leaking. So I got out of the shower and dried off and squeezed both nipples. And sure thing. Droplets. Any ideas?
So I took a preg test on Thursday and it was neg. I spotted yesterday pink when I went to bathroom and today period was suppose to start but nothing. Both  Nipples still leaking when squeezed