I've had this with all of my pregnancies. This time, it was my first pregnancy symptom. I thought it was weird that I had that discharge since I'd only had it when I was pregnant. I took a test, and it was a positive at 3 weeks along!! It is usually just hormonal, but I would get it checked out to rule out an infection, since it could be a symptom of two types of infections, which are very easily treated!