Hello, Thanks for your query. your description shows you are having infection of vagina(vaginitis) but pregnancy should be ruled out first.Common infectious forms of vaginitis include bacterial vaginosis, vulvovaginal candidiasis, and trichomoniasis. All of these can be predisposed by unprotected sex. Along with smelly discharge you may have itchy or burning sensation and redness over vulva. Fishy smell is sign of Bacterial vaginosis while creamy white discharge occurs in candidiasis. Consult your concerned doctor, who may take a sample of the discharge or do a Pap test to collect cells from your cervix for further examination. Some investigations like wet-mount and KOH preparation or Gram stain of the vagina may be needed. i advise to avoid unprotected sex, keep yourself hygiene and wash your genitals regularly,Wear 100% cotton underpants, and avoid overly tight clothing. hope it helps. Take Care!