Had another appointment with the specialist today and left a bit uneasy.

Baby Ollie has a mild dilation on his left kidney. It could just be where he needs to grow and stretch out more, that it's just kinked up. There's a 50/50 chance of that or the tube on that side from the left kidney to the bladder is narrowed to where when he is two weeks old they'd look at it and decided what to do from there. I go again at 33 weeks to check on him. He's 1 pound 9 ounces and a ham!

PS. I've had someone say this is common, especially in baby boys, and that it will work itself out in utero. I'm not sure how valid it is, but it did make me feel better.