Harmony test gender accuracy?

I was wondering if anybody knew how accurate the gender results from the Harmony test are. I had it drawn because I have a family history of muscular dystrophy that can severely impair affected males. Needless to say, I was a bit worried when my result came back that I'm having a boy!

I'm still thrilled, don't get me wrong, I just want to know if the gender section of these tests are accurate as I tend to worry a lot. :)

I had my blood drawn at 13+4. I had a chemical pregnancy that I lost the cycle immediately before conceiving this one- at 4+3. Thanks to anybody who can help! Even if all you have to share is personal experience, it helps.