My midwife says for a first time mom any time after sixteen weeks is normal. Second timers might start sooner. I'm lucky not to leak! But my body makes up for it when my milk comes in a few days after baby is born. I breastfed my daughter for just over a year and had to wear breast pads all the time!
I started leaking a little earlier than others as my midwive puts it, I started at 16 weeks and it's so bad I have to sleep with a bra on so my shirt isn't soaked in the morning.
I started leaking today. Its clear right now, im 25 weeks. With my first, i started around 30 weeks. Some women don't leak until the baby is born.
You don't produce milk until after the baby is born..however you do produce colostrum its pre milk that's what baby eats before your milk comes in