Its normal, this is my third pregnancy, with my first it was the white milky color with my second it was yellow also. I haven't experienced it yet with this one. As far as it happening more when you get out of the shower its because the warm water relaxes your milk glands making it easier to flow. After giving birth if you choose to breastfeed and find it difficult or your glands get swollen, take a warm shower and let the water run on your cheat for a few minutes or warm up a towel in the.microwave for just a few seconds and put it on your breast and that'll help. So does massaging the nipples and breast.
Glad to know it's normal I got nervous thinking it was something bad because I expected it to be white like w/my first pregnancy. Was also scared because I have Hypothyroidism so I thought that was messing w/my milk.
Mine is also a dark yellowish color mixed with a clear liquid. My what to expect book says its normal :) mine seem to do it more when I get out of the shower.