My baby measurements.

Ch

My baby was measuring 29w and 30w. The baby's head was 3/5th in pelvis. I went for scan at 31w they said she is bang on and she weighs 3pound 2oz. I went midwifes today at 34w. The baby head was down but not in pelvis and she was measuring two weeks behind but midwife didn't say anything about it. Should I be worried. Is this ok?