Both breast have nipple discharge during manipulation, urine pregnant test negativity, not taking meds or birth control what could this be besides thyroi?

Probably normal. Almost all women will have some breast discharge with manipulation after their first pregnancy. If you have never been pregnant, then please see you gynecologist to rule out other diseases such as evalated prolactin levels.
Prolactin? Hi. Prolactin elevation can cause breast milk production when you're not nursing. Since you're taking no meds, we don't need to consider certain meds as a cause for prolactin elevation. If prolactin is high, it would be due to a benign tumor in the pituitary gland. Prolactin elevation also typically causes cessation of periods...has that happened?