Baby Gender at 10 1/2 weeks

We had our first sonogram today at 8 1/2 weeks. Everything looked great!!! We had a miscarriage in Nov. I was excited when my doctor said I will see you in two weeks and we will do blood work and tell you the baby gender if you would like to know. He said it is 99% accurate. My doctor said he has been doing this new blood work for a few weeks. Anyone else having blood work for baby gender?