advanced baby growth

aleхιѕ • VERY proud mother!! Married тo мy вeѕт ғrιend, and perѕυιng мy D.N.M. (docтor oғ naтυral мedιcιne)
So today I had an appointment... vaginal ultrasound. According to my last menstral cycle I should be 8 weeks 2 days.... my baby is measuring 10 weeks and 2 days from head to bottom!! Has anyone had any previous experience with this? What does this entail? Thanks!!