I had protected sex and unprotected oral with a CSW 11 weeks ago. 

My wife has since had 3 periods in the last 6 weeks, one period coming straight after sex mid cycle, it was exactly the same bleeding as her normal period. 

My question to you, is this the sort of thing chylmidia/gono could cause? She has had no other symptoms, I have a lot of aching in and around the the testicular and lower back region and had a soar penis for 2 days but think it may be anxiety. 

The bottom line is that there is little chance your wife's new/irregular vaginal bleeding has anything to do with your extramarital sexual experience 11 weeks ago. I say this for several reasons. First, there are many causes of vaginal bleeding, changes in menstrual pattern, and bleeding between periods; STDs are uncommon reasons. Second, when gonorrhea, chlamydia or other STDs do cause abnormal bleeding, typically it is due to cervicitis, i.e. inflammation of the opening the cervix. Typical bleeding from cervicitis is quite scant:  spotting immediately after sex, or for a couple days afterward, but not an amount of blood similar to a normal period. Third, your vaginal sex was condom protected and oral sex is low risk for STDs. Fourth, chlamydia almost never is acquired by oral sex; and although gonorrhea is a risk from receiving oral sex, absence of typical symptoms (urethral discharge and painful urination) is strong evidence against you having gonorrhea. Finally the aching you describe is not a typical STD symptom -- as you suspect yourself, anxiety is the most likely explanation.

If your wife's abnormal bleeding pattern continues, she should see her primary physician (likely a gynecologist) to evaluate the cause. As already discussed, it is unlikely any STD will be found. If you would like an extra degree of reassurance, you could visit a doctor or clinic (or just a laboratory) and have a urine gonorrhea/chlamydia test. You can expect a negative result. In the unlikely chance of a positive result, of course you would have to discuss it with your wife, and she in turn could advise her gynecologist. For the reasons discussed, this outcome is very unlikely.

I hope these comments are helpful. Let me know if anything isn't clear.

HHH, MD

Very helpful 

Regards