In most parts of India, fewer than 5% of female sex workers have HIV, so probably your partner wasn't infected. Second, even without a condom, the average risk of HIV transmission by vaginal sex, if a woman is infected, is once for ever 2,500 exposures. So even if you had not used a condom, the chance you caught HIV can be estiated at 1 chance in 50,000 (0.05 x 0.0004 = 0.00002). And apparently you used a condom, so your risk probably is ten times lower than that.

For reassurance, you should be tested. You can contact local public health authorities or a local physcian familiar with HIV epidemiology in your area, for personalized advice about what tests to have and when. Based on what you say here, my advice would be to have an antigne-antibody ("4th generation") test in about 3 weeks and again at 6 weeks after the event. The first will be almost 95% relialble, the second 100%. You should also consider seeing a doctor or clinic for testing for other STDs, i.e. gonorrhea, chlamydia, and syphilis. Also be on the alert for symptoms:  if within 10 days you do not have discharge from the penis, painful urination, or penile blisters or sores, you can be pretty sure you weren't infected with these STDs.

I hope this information is helpful. Let me know if anything isn't clear.

HHH, MD