Diabetic nephropathy after pregnancy

Hi I have been diabetic t. 1 for 31 years. Last year I was pregnant and now I have wonderful son. Before pregnancy my kidney worked fine ( no diabetic nephropathy complication) but last few weeks of pregnancy I had high blood pressure and albuminorrhea. My baby was born in August. Now I haven't albumin in urea but microalbumins still exist. So mybe someone knows for how long the kidney to regenerate?