It does NOT just "clear up." It is a bacteria that causes it, and even if there are no symptoms, you will have it until you take antibiotics for it. Get tested. Your public health care provider, or Planned Parenthood can test for this. Also, if you have it, make sure to take ALL of the antibiotics. Not just until any symptoms go away. The antibiotics work by interrupting the formation of the cell walls of the bacteria, and they will be in varying stages of development. That's why viruses can't be "cured" by abx. No cell wall. Syphilis and chlamydia are also bacterial type critters.
Dont risk that it will clear up, see a dr for testing.