I need help with advice!!!

Yvette
Hello I will be 20 weeks tomorrow. They did the blood work to find out gender of baby and it came out boy!!! So I found at 13 weeks so I was set that it was a boy.. I went today to my anatomy sono it doctor says it looks like a girl I'm confused now what should I believe or what should I do.... I'm happy with whatever god gives me bit I'm confused..