21 weeks, leaking??

I was sitting on the couch and instantly felt that feeling in my s like my milk had just came in. I went to the bathroom to look at my and noticed they had become rock hard and was leaking white stuff, which I ume is colostrum. With my firstborn, I never got milk or colostrum early. Is this normal this early in pregnancy? Does it mean I am going to go into labor early or something???