Chlamydia, which is one of the most common sexually transmitted disease (STD) and is caused by an infection with the bacterium Chlamydia trachomatis. Symptoms associated with chlamydia, when they exist are, manifested by a yellowish discharge, milky (mucus-like), with a subtle but unpleasant scent, pain during urination or intercourse and abdominal pain. Undetected and treated, chlamydia can cause serious damage to the reproductive system.
Bacterial vaginosis occurs when the number of bacteria that form the normal vaginal flora increase considerably. Treatment is with antibiotics.
Trichomoniasis is an infection caused by Trichomonas vaginalis bacteria, and is part of sexually transmitted diseases (STDs), manifested by profuse and watery, yellow or green discharge, with an unpleasant odor and pain during intercourse or urination. Also, this infection has no symptoms for a long period of time after the exposure to Trichomonas vaginalis bacteria. Treatment depends on the cause.
You must be tested by a doctor, it can be a serious cause that can be treated but if not treated, it might cause serious symptoms that may present to infertility.