The white discharge can be due to unprotected intercourse
which you had,leading to minor infection,if you don't have any other symptoms like itching or bad smell you need not worry.
The blue veins
on areola and breast can be due to hormonal
changes need not necessarily be due to pregnancy
The pregnancy test can be negative if the hormone levels are not upto the mark,so negative test does not mean you are not pregnant,and if you have missed the period then there are chances of pregnancy.
symptoms you describe can be unrelated to pregnancy, might also be due to gastric upset.
So don't worry, and if you miss your period repeat the pregnancy test,and meet your gynecologist.