Chlamydia question.

My boyfriend and I have been together for almost 3 years. Back in 2015 we broke up for 3 months and had slept with other people. Now that we've been back together for almost 1.5 years, we're pregnant! At my first appointment in March I was tested for chlamydia/gonorrhea. My test came back positive. My doctor insisted I could not have gotten pregnant after a year of having chlamydia and that I would have been showing symptoms by now. She implied one of us had cheated and was adamant my boyfriend had done it. I was so upset but took the medicine without getting retested or anything. My boyfriend and I both used condoms with those other people and have been faithful to each other since we've gotten back together. He has not gotten tested yet due to him not having insurance right now, but is there a chance it could have been a false positive? We didn't have sex in between me being retested (I was negative), but I just cannot wrap my head around this. Thank you in advance.