Placenta!?

So I went for my 20 week ultrasound and my daughter is growing fine and her heartbeat is fine but they said that my placenta is supposed to be in the middle and it’s not it’s like in the corner of where my organs are which my dr said could alter the way my baby’s getting her nutrients so they want to do another ultrasound at a different place. Is it s very serious thing it has made me very nervous now just thinking about it