Pt 21yrs. 6 days of delay, first blood exam 3 days after missing period results negative, sensitivity on both breasts w. liquid at squeeze?! pregnant?

Not likely: Since you had a negative blood test, it is very unlikely you are pregnant. However, if you are not currently nursing, you might consider seeing a physician for a full evaluation of your nipple discharge. And also repeat labs is symptoms continue.

Possibly: Repeat the pregnancy test at 7d, if still negative and symptoms persist make an appointment to see your physician.