Welcome to the Forum. I have several comments about the episode that you describe which I hope you will find helpful.
For starters, that your partner has had multiple partners does not mean that she had STDs or HIV. In fact the chances are very good that she did not. In addition, for most STDs, including HIV, even if a partner has an infection, most exposures do not lead to infection. For instance, with HIV one 1 infection occurs for every 1000 exposures to infected partners. For other STDs like gonorrhea and chlamydia the chances are considerably higher but even for the most effectively transmitted STDs the chances of infection with a single exposure are no greater than 1 in 5 (20%). And remember, chances are that your partner was not infected.
Your exposure was essentially unprotected. To start sex, then reverse the condom and continue places her genital secretions in direct contact with your skin and vis versa. There may be some small element of protection but it is best to think of this exposure as unprotected.
The red dots and redness you noted are not due to STD or HIV. None of these problems cause symptoms for at least 24-36 hours following exposure. They may represent irritation that occurred during your exposure (and be related to the discomfort that lead to the condoms change).
The testing you had for chlamydia is accurate and should be believed. It really would have been better if your doctor had tested for gonorrhea as well however since 10% of gonorrhea is asymptomatic. As for the blood tests for syphilis and HIV, it was too early. These tests take several weeks for infection to become apparent in a blood test. On the other hand, both of these infections are quite rare and your chance of having gotten one or the other is quite small.
Chances are that you did not get infected through the exposure that you describe - the statistics as well as the absence of symptoms since that time are in your favor. However, if you wish to be sure based on testing, I would suggest repeat testing at this time for HIV. It is up to you if you wish to be tested for gonorrhea and syphilis at that time - as I said, the chances that you got infected are quite small. I predict that the tests will be negative.
Finally, as for the red dots, I cannot venture a guess as to what they might be. If they are still present or if they re-appear, I would suggest you have them examined discuss them with your doctor. They really do not sound like an STD however and likely represent some other, non-STD dermatological process.
Hope this helps. EWH
I plan to go for a full STD retest for everything apart from chlamydia and I will go to the doctors if the red dots reapear.
Just to satisfy my curiosity I was just wondering why the probability of hiv infection due to unprotected sexual contact is so low? Not a problem if you don't have time. I'm sure you're a very busy man. Thanks again!
As for the probability of HIV transmission, or for that matter any other STD, the "efficiency" of transmission is a biological characteristic of the organism. It may be modified by variables such as duration of intercourse, etc but basically it is a biological characteristic of the pathogen involved. Take care. EWH