bpd and head circumference(hc) are lagging behind on biometry by 3 weeks at 9 month of pregnenc...should It be a concern

A. Maam three weeks you are mentioning so I think it would be a matter of concern but apart from that how the growth of the child is going at the Dr saying there’s a problem or not because everything would be based on the overall development and growth but plus or -2 weeks is considered normal but for three weeks I think it would be good for you to discuss the issue with the Dr