Had a pregnant bl test on friday came out neg. today (6 d w/o period) i've been tired, sensitive and having a vag discharge. its possible to be pregnant?

Probably not, but...: Pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, vaginal spotting, or medications. A blood test gives a reliable result 2 weeks after sex or after missing a period. If done sooner, a negative result may be due to testing too early, such as less than 2 weeks after sex. One can retest with a urine test 1-2 weeks after a blood test.