I have that same stuff in my nipples too. I dont know what it is though i haven't had any leaking or anything and I'm 39weeks
Its directly on the tip on the nipple(the whitesh stuff) and it tends to be dry around it as well. I'm 27 and I haven't leaked but it tingles a lot. I'll be sitting there and it will feel like my nipple fell asleep and woke back up.
That's probably dried colostrum. That's what i noticed first around 24ish weeks. Now i'm 35+3 weeks and am starting to leak through my bras.... :/
I started leading around 23 weeks & it's probably dry skin around the nipples.I have that happen all the time & I rub Vaseline on them & it stops the dry itch & scaling 4 days. I am now 35 weeks.
I'm 15 weeks and mine started leaking last night. Early I know! It was quite heavy but seems to have settled down now. Mine have been quite dry too, you can use a nipple cream while your pregnant if it bothers you :)