Wrong dating?

Hannah • Mommy of an angel baby, a handsome 2 year old, a beautiful 1 year old and pregnant with our surprise baby

So my dr called yesterday due to my little girl being bigger than expected on the ultrasound. So I have to go back today and get another ultrasound done to see what the possibility of being induced is. Last ultrasound I had was 2 weeks ago and I was 31 weeks and apparently she is measuring 36-38 weeks already. Is there a possibility they got her dating wrong? I’m so worried. I don’t want to be induced too early.