dilated kidney...?

Victoria • Harley's mommy 💙👶🏻12-4-16 Due with baby #2 Oct 2024 👶🏻
I just left my 36 week ultrasound and my babies right kidney is slightly dilated. The normal size is 7mm and his was measuring 9mm-11mm. I'm a FTM and I'm frantic and hysterical. Has this happened to anyone before? What was the outcome? This is the first time they've ever detected it, in previous ultrasounds it's been completely normal. 
Update: he was born and it was completely normal! 😊