Baby measuring small

Rad

Hi ladies.. I got a question. My due date according to my LMP that is my gestational age is 13 weeks 2 days. But baby is measuring at 12 weeks 1 day. At each scan namely at 6,8,12 weeks, the baby measured two or three days less and now the total difference seems to be a week. I consulted the doctor and she said a week difference is still ok. Still I'm concerned. Have any of u measured small and near your due date baby grew up to the proper size or something??