Nipples leaking at 19 weeks???

So I am 19 weeks and my nipples are leaking A LOT. Is this normal?? I know you are supposed to leak some towards the end of the pregnancy, but do they usually this early? They have been leaking some for several weeks now but not like this. In the past few weeks I've been waking up to my nipples having a lot of white crusty stuff on them like they had leaked and dried overnight, but today I was cleaning around the house and not wearing a bra, and they were leaking through my shirt and dripping down my finger when I touched them. Is this ok or is something wrong? I'm in the middle of switching doctors right now because I had a terrible doctor before, so I don't really have anyone to call right now.