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Generally, by book, it needs 18 months for your uterus to heal from the previous cesarean cut, but healing is regulated by many factors like intrinsic tissue quality, general nutritional status of the lady, the healing power of the body, diabetes, postoperative convalescence, sepsis, the presence of protein diet, etc.
Since you had another C-section, did the doctor mention the difficulty of the cesarean section at that time? Did your first and second cesarean go well or was associated with greater care than general? Since the healing is dependent on a lot of things, and also the uterus can never come back to its original strength due to two scars on the body, so the two-year safety mark. So, if you wish to take the pregnancy sooner, you should be compliant in visiting a doctor in a tertiary care center, with an emergency OT and blood bank facility.