I think that it can vary, just like other pg symptoms vary with each pg. With #1, I leaked colustrum around 30 or so weeks...I mean, it was just a couple of drips...probably only noticed it as it was summer at the time and I had no PJ top on and I felt something drip onto my arm lol. Then in pg #2 I didn't leak at all. Had no problems with milk production/bf either of them afterwards. In this pg, I've probably leaked colustrum the most - would often wake up and have little stains on my PJ top from it.

So don't be concerned about this being a problem when you bf.