It's my 31st day of cycle. after 11 days of brown discharge, i had few spots of white discharge. is that definite sign of pregnancy? please help.

Pregnancy? STD?: Pregnancy can be accompanied by changes in vaginal discharge, but is not a "definite sign" of pregnancy. Colored discharge often means infection, and age 20 the main causes of genital/vaginal infection are STDs like gonorrhea, chlamydia, or trichomonas. Any new or abnormal vaginal discharge should be medically evaluated, so see your doctor or a clinic. STD testing should be incluced. Good luck!