Kidney - Urine backing up at 22 week scan

So

Hi, I had my 22 week scan today and doctor at Ultrasound office said, left kidney is backing up a little bit of urine. There might be a slight chance of Down syndrome. My all Down syndrome tests came out normal.

I have my Ob appointment in two weeks. I freaked out after today's visit at Ultrasound scan.

Did anyone had similar experience?