What are the chances of contracting chlamydia/gonorrhea from precum? had unprotected vaginal intercourse before and he never ejaculated inside me this happened over a year ago and i had no symptoms before not until i have vaginal discharge now?

Any transfer of sexual fluids into your vagina can give you Chlamydia or Gonorrhea. That said, symptoms would be expected to show up in the weeks after exposure, not more than a year later. It is likely your discharge is from some other reason. However, when you go in to be evaluated/treated let them know you want to be screened for STD's. Not all produce symptom.