Pregnancy is usually not recommended after 3 years of stage 1a breast cancer. Stage 1a breast cancer patients have a relatively mild condition and are in the early stage of the disease. However, the condition of patients after 3 years varies from person to person. If metastasis of cancer cells occurs, it is usually not recommended to get pregnant after 3 years to prevent the disease from affecting the body, which is not conducive to the normal growth and development of the fetus. Besides, even if the condition of stage 1a breast cancer patients has not worsened after 3 years, the disease can still cause great influence on physiology and psychology, in which case pregnancy is also not recommended. Stage 1a breast cancer patients should go to the hospital in time and take appropriate treatment.