I was recently diagnosed with chlamydia following a routine check up at my local clinic after sex with a new partner became a more serious relationship. I last had sex with another person about 10 days prior to my first time with her and haven't been with anybody else since. She was tested about 7 weeks after our first encounter and was negative, however my test came back positive a couple of weeks later. Knowing that I haven't had any sexual contact with anybody but her, is it possible that I could have had the infection from before and she didn't get it from me even sleeping together regularly for almost 2 'months? Or is it a possibility that it could take longer to show up on a test than 3 week guidelines?