Dating ultrasound

Hello all! I went for my dating ultrasound a few weeks ago and got my results today. We were told that according to my LMP Im due February 22, 2020..and my dating ultrasound is saying I’m due January 22, 2020...just wondering if this has happened to anyone else? I got the results from my family MD and asked him if it could be a typo and he wasn’t sure, he’s a fairly new doctor and has never had this happen before, I see my OB in 2 weeks but has me wondering if I’m actually due a month early. Just hoping to see if this has happened to anyone else and if anyone knows what’s going on