How early does nipple discharge occur in pregnancy?

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I’m 26 years old (well past puberty) and I noticed a little crust on my nipple. I lightly squeezed my breat and a clear liquid (i think clear???) dripped down my breast.
I know not all nipple discharge is due to pregnancy, but how early in a pregnancy can nipple discharge occur?

It usually doesn’t happen early in pregnancy. IT usually happens from a hormonal imbalance of prolactin or too much simulation (like a piercing might do this eventually over time)This is a good site to look at http://www.womentowomen.com/breasthealth/nippledischarge.aspx and http://www.imaginis.com/breasthealth/nipple.asp
Hope that helps!