Umbilical cord on side of the placenta

Sussett

http://www.dovemed.com/diseases-conditions/marginal-insertion-umbilical-cord/

So my doctor very casually mentioned that Blueberry umbilical cord is attached to the side of the Placenta. I had no clue as to what he was talking about and he moved on so I didn't really very a chance to think about what he said. Now I'm reading up on it and I'm worried. 😧😧😧

Anyone have experience with this? I'm a FTM