Blood test was wrong feeling down..

Breeanne

So I did the blood test at my dr office for gender at 8 weeks.. I have a girl already shes almost 3 we had results sent to my mom and did reveal 4th of July we got boy result my husband was so excited a son he always wanted he chose a name and bonded with his "son" every night before I went to bed after work he would rub my belly and talk to his son and love on him... i had my anatomy scan yesterday and its a girl!!!!! We both was shocked I cried cause my husband was crying im happy I have a healthy baby but I thought the blood test was 99.9% accurate? I'm just still a little upset...