Ob-Gyn questions? Ask a gynecologist online.
Hi and thanks for the query,
Whenever your body undergoes stress in your case is surgical stress it can affect your hormone levels plus you must have reduced some weight so all these things can alter hormones and so periods can be irregular for some cycles. It would come back to normal level after couple of months. Ultrasound would be helpful to rule out any pelvic problem.
Let me know if you have further questions.
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Wish you good health.