It is difficult to know how to interpret your positive chlamydia test. Your risk from a single exposure was very low, and generally it takes a few days after acquring chlamydia for tests to become positive. So I have to suspect you had it before the exposure a day previously. In that case, your regular partner had already been exposed and probably infected (and might have been the source of your infection), regardless of the treatment you had in the meantime. I would not have recommended you be treated in this situation, but if you indeed had an active or brewing chlamydial infection (or gonorrhea) the antibiotics would have aborted it, rendering you non-infectious 2 days later.

Standard policy is for all partners of people with positive test to be treated, without waiting for their own test results -- or even if those results are negative. So your regular partner needs to be informed, tested, and treated.  That's not the news you wanted to hear, but I'm afraid there's no getting around it. In any case, I think there's a pretty good chance she'll have a positive result when she is tested. I probably don't need to tell you that when relationships are stressed to the point that one partner has outside relationships, often the other has done so as well. So you may find your partner isn't much surprised by all this.

Sorry it's not what you wanted to hear. But let me know if anything isn't clear. Best wishes--  HHH, MD