How soon after exposure to chlamydia would a swab give a positive result?

I had a routine STD test done with my doctor a few months ago and everything came back negative. I have been having some other problems lately so my doctor decided to do another chlamydia swab? Assuming that my boyfriend has been faithful and I have not caught anything from him, I asked her why she wanted to do another swab if my results were negative last time and I had not been with anyone else since? I asked her if it was possible to have a negative result then and have a positive result now. She said depending on when I was infected (if I was infected) it may have been too early to detect. So my question is.... how long does it take to have a positve result for chlamydia after exposure? I had been with the "suspected" person a few weeks to a month before my test was done, if I did have chlamydia wouldn't the positive result have shown by then?

[auntiejessi]

It takes 3-5 days to show on a test, so it would have been found on your previous test.

AJ