Had cold knife cone biopsy for cervical carcinoma in situ 4 months ago. clear margins. now i am having heavy periods. concerned?

Heavy Periods : The sudden onset of heavy bleeding, even in the context of your regular period, is always a reason for follow up with your gynecologist, regardless of the previous history. It doesn't necessarily mean that the cancer has returned by any means, but i would contact your gynecologist for guidance.

Not about cvx cancer: There shouldn't be any causality between having the cone and the new onset of heavy periods. The heavy periods don't have any assocation with cervical cancer, (cervical cancer, cis, dysplasia - usually causes bleeding after intercourse, and/or some irregular bleeding, but don't cause heavy periods.