I had the same problem... i had colostrum leaking from so early (I can't remember how early, i wrote it down in my journal but its all the way out in the lounge room! but it was before 20 weeks), and now I have to get some out daily (or milk myself as Shel puts it... ) or I leak everywhere if I dont... when I express it I end up with at least 10mL (I kid you not, its really embarrassing!). my midwife says its fine, its all individual just like when and how you start showing and ms etc... so I wouldn't worry too much (unless of course if it seems liek it might be an infection or something like that...?).