The symptoms of Chlamydia can be absent for months, but you can still pass on the infection and if it is left untreated it can lead to serious complications including infertility. It also makes you more susceptible to other STIs including HIV. Some symptoms to keep an eye out for, if you’re a lady, include pelvic pain, bleeding after sex or between periods. Guys if you notice a clear discharge from your penis or experience pain when urinating it’s a pretty fair sign you need to be tested.