21w+4d and not lactating?

Jane • FTM due on Feb 4,2016 with my princess <3 💖🌺🌸👨‍👩‍👧
I've been reading posts and everyone around this time seems to be lactating, and I'm not. I haven't had pain in my breasts for a while, they don't seem to be bigger and not even a drop of colostrum. I'm worried because I was hoping for at least the first 4-6 months to breast feed a lot, but now I'm wondering if I'll be able to at all!
Is this normal?