It's colostrum nor milk. Milk production starts abt 1 to 2 days after deliver. Production of colostrum can start as early as 14 weeks pregnant. If it's leaking too much u can use breast pads.
Mine started leaking at night at 25 weeks. I'm 26 and 4 now and still leaking. It's weird.
I'm 29 weeks and mine have been leaking since week 26 maybe week 25.