13 week ultrasound

🌷Kierston🌷

So this is like 2 weeks late but I had an elective ultrasound at 13w 3d and found out we are having a girl. They also did measurements of the baby and said she was measuring at 3oz. Every app that I have says that baby isn't even 2.5oz now at 15 weeks. Does that mean baby is big? I know ultrasounds can be off a lb or 2 later in the pregnancy. This is baby #2.