21 weeks

This is my second pregnancy, my daughter is going to be 4 at the end of this month and recently I’ve been noticing my nipples leaking a bit, it’s the milky color it should be ur Idn if this should be happening this early. Is this normal? Any other moms to be dealing with this? I don’t remember this happening this soon with my first. Sometimes I get that ‘full’ feeling that aches and hurts in my boobs as if they needed to be milked lol i may sound crazy but am I alone on this?