Help!!!

I went for an ultrasound at 32 weeks last week! today had a normal checkup & my Dr is recommending me go to a high risk ultrasound tech to get a second opinion. My baby girl is measuring 3 weeks behind, head measuring in the 23rd percentile, abdominal measuring 17th percentile, and femur is in the 10th percentile. Has anyone ever had a baby measure small then hit a growth spurt?! My SO and I aren't  exactly giants..I'm 5'1 & he is 5'6 on a good day. I'm stressing myself out 😿