Yes, you can be infertile after having chlamydia, but most people who had chlamydia are not infertile. You should abstain from vaginal sex or use contraception if you don't want to get pregnant. Untreated chlamydia and gonorrhea can cause scarring which can impair fertility, but a history of chlamydia doesn't mean you can't get pregnant. In women, one in five with chlamydia develops pelvic inflammatory disease, sometimes without knowing. Of that fraction, one in five will be infertile.