Your HSG is suggestive of developmental abnormality in your uterus with one of your tubes blocked. HSG is an excellent imaging modality for checking the functioning of female reproductive system but may not give complete detailed information in case when an abnormality is detected
Next Steps
It would be ideal to do not only a Laparoscopy but also a Hysteroscopy to figure out the type, extent and implications of the abnormality.
Health Tips
With one tube open and with a unicornuate uterus; you can still get
pregnant if there are no other major fertility in you and your spouse. All the best!!