Yep i had the same thing at about 28 weeks too. I woke up in the middle of the night thinking i had dribbled on my arm. I turned on the lamp looked down noticed my nipple looked wet so i gave a little squeeze and colostrum came out i screamed in shock. Knowing it was going to happen soon but still very shocked to see it happen for the first time, my husband thought their was a intruder the way i carried on. But first pregnancy it was still weird but very normal.