I still have periods lasting 5-6 days even though i had an endometrial ablation 5 months ago. the blood is brown with clots. should i be concerned?

Not concerned: Not likely to be a serious concern. Likely this represents a relative failure of the ablation. Perfect outcomes (no bleeding or amenorrhea) happen generally less than half the time depending on the specific type of problem and type of ablation you had. Bleeding as before or heavier is a true failure and happens less than 10% of the time. What you describe is a common outcome, still a success.

Failed ablation: If you still have heavy menses 6 months after an endometrial ablation, this is considered a failure. It is important to understand that 15% of ablations fail, higher if you have fibroids. There is no indication to repeat an ablation, not even another type. You may want to consider a laparoscopic supra cervical hysterectomy. Our physicians do this as an outpt procedure, back to work in a week!