Too many ultrasounds

So I read somewhere that too many ultrasounds can harm the baby but I want to have one before Christmas. I had an ultrasound on Nov. 23rd and I met with my doctor on Mon. 7th where he didn't do anything because I'm only 9 weeks. I won't be meeting with him again until January to schedule the anatomy scan. There is this clinic that does free ultrasounds from 8-12 weeks! I'd love to get one next week or the week of Christmas. Should it be okay?