Pregnant 22 weeks discovered to have renal impairment no past history of significance kidney ultrasound within normal, serology negative. What is your advice dialysis or what

This is a question for your own medical practitioner as they have a full picture of your medical history and medication.

You will have to discuss this with your physician of record.

I'm with everyone else... this is something you MUST discuss with your personal physician. And don't delay.