From the sounds of your description you live in a place where there is an identifiable risk tht your partner may have had either an STI or HIV.  Most single exposures do not result in infection and while the duration of your exposure was brief, and logic tells us that exposures of shorter duration should be less risky there are no scientific data to validate this assumption.  Thus you may have been exposed.  If that is the case, as the insertive partner, if your partner had untreated HIV, your statistical risk is les than 1 infection per 1000 sex acts.  In addition, again IF your partner was infected, there is a statistical risk for acquisition of her STI.  The quickest and most definitive way to determine your risk for infection is to arrange for your partner to be tested.  If her tests are negative, there is no risk to you.  If that cannot be done, then, depending on how long ago this exposure occurred, you may wish to consider use of HIV post exposure prophylaxis (PEP) and testing for STIs.

If you could tell me how long ago your exposure occurred, I can provide more information.  EWH

Thanks for your prompt and detailed response. Unfortunately I did lose my last account so had to create a new one. 

Although I like to think the short exposure duration makes it less risky, as you said, there is no evidence to support this. 

If my partner was positive but was on medication such as PEP, would that lower my chances of exposure? Also, would a little scratch on the skin (Not open wound, rather, almost healed with scab) increase my chances of infection?

At this point it's roughly been a little over 36-40 hours since the encounter. This happened in Turkey and although prevalence here is quite low, it's apparently been on the increase. Unfortunately she was a "street walker" so the option of getting her tested is slim to none. 

I have considered PEP but the medication here is not as easily accessible as back home, and although the statistical risk is low, it's still there.

Considering testing, how soon can I get my first test to make sure it's somewhat accurate? Or do you suggest PEP is a must at this stage?

Thank you

The scratch would not meaningfully change your risk for acquisition of HIV.

If your partner is on effective treatment for her HIV, then there is no risk for infection- effective HIV treatment prevents transmission of HIV from infected to un-infected persons.

Given the variables you mention, I think a strong case can be made for seeking PEP even with a more than 99% chance that you were not infected.  PEP is typically well tolerated and highly effective.  If you choose not to, or cannot get PEP, then your can test with an HIV RNA PCR test as soon as 12 days following exposure.  If this test is negative, then, although a follow-up 4th generation combination HIV antigen/antibody test at 6 weeks is recommended, I have never seen or heard of someone who had a negative PCR test any time more than 12 days after exposure who went on to develop a positive test.  If HIV RNA PCR tests are not available, then at 4 weeks a 4th generation, combination HIV antigen/antibody test would be more than 99% conclusive.

I hope this information is helpful.  EWH

It's comforting to hear the scratch does not change much, as it was initially my main doubt. The condom split into two so the tip may not have been exposed but the scratch definitely was. 

Did some research into the PEP they got here and I see people saying they took both Truvada and Isentress, although not sure if they both go at the same time? Please enlighten me a little about this, should I get both, and if so, how long and at what dose should I be using these for?

Other than HIV, should I get tested for any other STI? I think I will go for a general test that looks for most/all when the time comes. (12th day)

In terms of testing for other STIs, you can test for gonorrhea and chlamydia and get conclusive results any time more than 3-4 days after your exposure.  For testing for syphilis, I would wait until at least 30 days following your exposure to test for reliable results.  

I hope this information is helpful.  As you know, we provide up to three replies to each client's questions.  Thus this will be the final response and the thread will be closed shortly.  Take care.  EWH