Nipple leak question?

Amber
Hey ladies! Ftm here. I'm 27+6 and have been leaking clear fluid since around 17 weeks. The last few weeks the "leakage" has taken on a creamy/almost white look to it. Sometimes being completely white. Is this just a next stage of development for breastfeeding? Is it milk or colostrum? New to all this so I appreciate your help!