Baby Size! Advice Please.

Leah. • Hey beauties I'm Leah and I'm currently pregnant with my precious baby girl🎀 3.30.15💕
My Dr told me I was having a small baby I'm 32weeks tomorrow and my last ultrasound was Tuesday the 27th she was 2lbs 12oz should I be worried I know I have 8weeks to go hopefully she gains the weight she needs my first born was 6lbs 7oz full term should I  be  worried  or just keep calm