What does a week of clear discharge mean?

I was suppose to start my period on the 12th. I have been having clear discharge for a week now. When I'm ovulating, I have globs of milky colored discharge for a day or two. I ovulated the 19th of May. Since the 7th of June I have had clear discharge. Usually 1-3 days before my period I have spotting, and I didn't have any. No cramps, no thing. If I am pregnant this would be my third, so I know what the symptoms are, but I have never had clear discharge for a week like this. It's constant. Also, a week and a half ago I had the filling that my breasts were filling up with breastmilk, and a few days ago I pulled on the nipple and a yellow substance like colustrom came out. I've had stress the last ten months, but my period has been regular since, except this month. I am nauseous, but I have been the last two months due to my divorce and two weeks ago, my appetite increased, so I thought I was feeling better. Negative pregnancy test on Saturday night, but that was the 11th, and my period was suppose to start the 12th. Anybody experience the discharge and find out something? Thank you for your help!