Wrong gender

So I got my blood drawn at 10w3d! At 12 weeks found out we are having a girl! We are over the moon as this is our last and already have two boys. I just read online so many stories of women who got girls results for panorama and ended up with boys. Apparently the Y chromosome never showed in their blood! How common is this? I’m so worried and already bought so much stuff :( won’t have an appointment until 2 weeks but don’t even think it’s an US appt, ugh 😭😭