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Chlamydia is an infection which appears very mild and may be asymptomatic, but the damage it causes is quite extensive. The main risk is of damage to the inner lining of tubes and also the structures surrounding the uterus. It can create a block to the movement of the sperm, egg, and embryos.As you have been treated in the hospital, the infection has been handled thoroughly and adequately.
You can find out if there has been any damage to the tubes, the bridge between ovary and uterus, where the egg and sperm meet to form an embryo. Either have an HSG (hysterosalpingography, X-ray with dye) or laparoscopy to clear any adhesions. If this path is clear, then there is nothing to worry, and you will surely get pregnant.
Quality and quantity of eggs are affected by these infections. At this age of 20 years, you can get pregnant.
There could be many other reasons for no pregnancy.
1. Have your partner's semen, blood sugar tested.
2. Have your blood sugar, and thyroid tested.
3. Has an abdominal and pelvic scan done to rule out any abnormalities? Out of these tubal patencies is most important.
Worst scenario if the tube is blocked, it needs to be cleared by hysteroscopic tubal cannulation, or if the damage is not correctable, then IVF (in-vitro fertilization) is the solution. I hope I have clarified your query, do write back if any more questions.