<s>[INST] I once had Chlamydia because I didnt use a condom during sex, I did it again but surely this person I am with doesnt have anything. The smell of fisChatDoctore back right after I was finishing my period- is this from my period or has Chlamydia come back from my previous boyfriend or do I have a new infection from this partner? [/INST] Hello, I can understand your concern. Fishy vaginal smell is most commonly due to bacterial vaginosis, a bacterial infection of the vagina. It may be triggered by having sexual intercourse with a new partner so that fits your description too. The other possibility is Trichomoniasis. Though it is Sexually transmitted Disease, it is very easily cured. Good thing is, either bacterial vaginosis or Trichomoniasis, the treatment stays same. I would advise you to take Levofloxacin 250 mg (Aeroflot) twice a day for five days. The smell should disappear by the time the course is completed. If it does not improve in five days, a gynecologist should be consulted for physical examination and vaginal swab analysis. I hope this information helps. Thank you for choosing Chat Doctor. Best, </s>