Mine hardly leaked at all when I was pregnant - just a tiny bit of colostrum a couple of times. I felt as if my milk was never going to come in for the first few days, but woke up on the 4th morning (I think) feeling like I'd had a boob job in my sleep! You'll be fine, don't worry. Leaking during pregnancy doesn't mean that you'll be any more successful at breastfeeding. While you're still pregnant, your placenta produces progesterone, which inhibits the function of prolactin (a hormone involved in milk production). Once you give birth and the placenta is delivered, progesterone levels drop, prolactin gets to work and a few days later you should have lots of milk!!
xx