Are sneak peek girl results accurate?

I got my sneak peek results and after 2 boys, it says we’ve got a baby girl on the way! I didn’t want to get my hopes up, but I’m so excited! I’ve read that girl results are typically correct, but that sometimes being over weight can cause a false female result. I’m overweight and now I’m questioning whether my results are accurate. I’m happy with a healthy baby, but now my husband and I have our hopes set on a girl. Anyone have this happen? Or were your girl results correct?