To answer your question, I am breastfeeding so it would be impossible to tell if I was leaking milk related to pregnancy or breastfeeding.
Actually, no matter how early or late you leak as no bearing on how much breastmilk your body will produce. Breast milk is made on a supply/demand basis generally, meaning the more you nurse your baby the more your body should make. Of course there are issues that may crop up that cause women to struggle with inadequate supply but generally that's how it's "suppose" to work.
If you're at all concerned with supply the best information I can offer is to put baby to breast. Don't offer supplments (bottles, pacitifers, formula, etc) and don't watch the clock. Let your baby nurse whenever they want to nurse. Also, contrary to what some women think, pumping later in pregnancy won't make your milk come in any faster. The placenta detaching is what actually signals the breasts to begin to make milk. Like I said above, there are certain things that can impact how long it takes milk to come in (certain medications used during labor and delivery for instances) but generally your milk should come in a couple to a few days after birth regardless of whether you pump or not.