When should i start leaking?

Johanna • Mommy to a prince and a princess 💜 && a wife to be 💍
So im almost 30 weeks pregnant. This is my second baby. My last baby, my milk dried up in two weeks. It says that i should start leaking around this time. But im not. Should i be worried? Should i also be worried that i might dry up again? I hope not because it devastated me.