thanks doc. it's going to be a long 3 weeks. One thing i forgot to add, on the tip of my penis i have dry skin, red and almost a rash. Would this make me more likely to catching something?
Indeed, it sounds like your partner probably is at high risk for having any number of STDs. On the other hand, the risk of transmission of any STD from a single encounter is pretty low. HIV in particular isn't much of a risk; it is statistically very unlikely your partner had it, and if she did, the average chance of transmission was only 1 in 2,000. We don't have as good data about herpes risks, but on a per-exposure basis they probably are in the same ballpark as HIV. Syphilis is equally unlikely.
For the next 2-3 weeks, be on the lookout for common STD symptoms, i.e. discahrge of pus or mucus from the penis (sometimes with painful urination), or genital sores. If none of those things develop, the odds are strong you weren't infected. But if you want even greater security, you could attend your local STD clinic or see your primary care provider for routine STD testing. Gonorrhea and chlamydia (tested by urine sample) can be done accurately anytime after 2-3 days since exposure. Syphilis and HIV testing can be done accurately at 6 weeks or so. I recommend against testing for herpes if you don't develop symptoms; in the absence of symptoms, the chance of infection was too low to make it worthwhile.
I hope this helps. Best wishes-- HHH, MD