Blood test to find out sex of the baby

Emilee
Hi everyone! My husband and I found out that I am pregnant this past Monday and we are both ecstatic! One of the main things that we are excited to find out is if we are having a girl or boy. My mom told us that now, at 9 weeks you can find out the sex of the baby with a blood test. Has anyone done this? If so how accurate had it been for you?