Yep, sounds to me like your boobies are gearing up! YAY!

No, doesn't necessarily mean you'll go early. I had colostrum from VERY early, before 20 weeks, and Jazz was born pretty much right on her due date

If the leaking becomes a problem, buy some cloth breast pads. The disposables are so uneconomical, considering the amount you'll leak makes it just damp enough to want to wear breast pads sometimes, but really buying a box of breast pads a week just for a teeny tiny bit of colostrum every now and then makes it so expensive!