You can get pregnant still, depending on any damage the chlamydia may have done. Your OB/GYN or fertility specialist should be able to determine your risks. If you have it actively right now, it would be best to finish the treatment for it before trying to conceive. I am unsure if it affects a fetus, and am also unsure as how medicines used to treat it could affect a fetus, but am pretty sure it can affect the fetus during delivery.