hi .. i had unprotected sex during my period few weeks ago like around the 11th march he ejected outside me, my periods did get over at the normal time .. now im getting like a brownish fluid stain .. i have checked the net and these results came up cervical cancer , Pelvic Inflammatory Disease (PID), perimenopause, or sexually transmitted diseases like gonorrhea, Chlamydia or vaginal warts . and im 16 years .. and i have not done a pregnancy test or i am not showing any signs of pregnancy .. please help !!!!!!!!!!!!!!!!!!!!