With my first I started finding a bit of crusty dried colostrum on my nipples, or occasionally on my shirt, so I tried hand expressing and got a little. This time Teddy was still nursing when I got pregnant, so I saw when it dried up, and a few weeks ago he was sick and wouldn't drink water so I tried letting him nurse more frequently and I was a little milky after he unlatched. I'm not sure if him being sick helped trigger it coming back. I finally weaned him off of his last nursing session when he was feeling better, but I can still express colostrum if I try.