Anatomy scan at 20 weeks

I had my 20 week anatomy scan today, I'm actually 21 weeks, and a few hours after leaving the office I got a call saying I need to come in for X-rays. She said it wasn't uncommon for them to ask you back for X-rays. I didn't ask if anything was wrong because I'm honestly just terrified. Has anyone had to get X-rays? I'm really worried. I should also mention that I am 32, not sure if that makes a difference.