Nipple leaking

Claire

So I woke up throughout the night with a crusty nipple TMI sorry... Today it is ever so slightly leaking a clear yellow liquid. Is this colostrum coming through already I'm almost 21 weeks and it's only from the one. By nipples have been very sore and itchy and has made me most irritable. Has any one else experienced this early on?? And is it normal at this stage??