With my 1st& 2nd I didn't until after birth (breastfed both) but being pregnant now with #3 I've started leaking at 17 weeks.
Ok! I was thinking I wasn't far enough along yet, and I looked at my bra and it had a few little wet spots right where my nipple is, and I was like uhm? 😅 @laywells
Mine still don't really leak but the collustrum comes out every now and then, and that started right at 25 weeks.