34 weeks pregnant

So I received a call from my OB office to get a 2nd fetal weight ultrasound done with a consult with a doctor. Has anyone ever had to get a 2nd weight in there third trimester 4 weeks apart from one another? I know the baby’s head is measuring 3 weeks ahead. Is this to tell if they need to induce me early or to see if I need a c-section? Or simply to be safe and have another measurement to see if the first one was correct. They kind of have me worried. Baby is head down as of last ultrasound.