Beta thalassemia is inherited as an autosomal recessive trait. So if only one of the gene has mutation, the child will have thalassemia minor, which you also probably have. Thus the baby will lead a normal life. However, if your husband also has thalassemia minor/major, then the chances of the baby having thalassemia major or an autosomal dominant trait is pretty high. This can cause major problems for the baby after birth, including frequent blood transfusions. This is the reason doctors ask both the parents to undergo the test. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.