Could you let me know the statistical possibility that I acquired a chlamydia infection in my throat… what the statistical probability of me transmitting said infection from my throat to his penis …. Possibly of him having asymptomatic chlamydia for 5 months… and me testing negative on urine with a normal pelvic exam? 

Chlamydia is certainly a common STI and can be present without symptoms.  For reasons that are not well understood however, there is something biologically about Chlamydia that makes it unlikely to infect the throat.  Thus even if your casual partner happened to have chlamydia (which is statistically unlikely- most people do not have chlamydia), the chances that it would infect your throat when you performed oral sex is very low.  Finally, chlamydia does tend to cure itself with the passage of time so, given that your exposure was about 6 months ago, in the unlikely circumstance that you have chlamydia, you would have probably cured yourself of it by now. 

Your negative chlamydia test in August is further evidence that you were not infected.  If you had been infected in the throat, you probably would have infected your BF when you performed oral sex on him and he would have given it to you.

 Putting all of these things together, the chance that you acquired chlamydia, that you still have it, or that you would have given it to your BF is less, and probably substantially less than 1%.  I would encourage you not to worry and to do your best to move forward.  

If any part of this explanation is unclear or there are further questions about your risk for chlamydia, please use your up to two follow-ups for clarification.  EWH

Your negative test in August is strong evidence that you are not infected. Lower abdominal pain can have many possible causes, including as a complication of chlamydial infection. A blood tinged. Vaginal discharge may also be a symptom of some thing going on. The right way to be a valuated for your lower abdominal pain and your concerns is to see your gynecologist and request evaluation, including testing.  My best guess is that your symptoms are due to something other other than chlamydia, but I would urge you not to take a chance, and to work to identify what is causing your difficulties. EWH.

STIs are not a matter of blame.  They happen.  People who acquire STIs do not do so on purpose and people who transmit them to others do not do so knowingly.  It most often occurs when persons do not know they are infected or even at risk.  The important thing for you is not to be sidetracked by the unwarranted stigma associated with STIs and get yourself evaluated.  

It is more likely than not that if you had acquired an STI from your misstep, you would have transmitted to or contracted the infection from your partner by now.

It remains unlikely that you have any STI.  

We provide up to three responses to each client's questions.  This is my 3rd response so this thread will be closed later. Please don't worry.  EWH