is she 6 weeks preg or 8 weeks.pls help

she is 8 weeks according to her menstrual age. on sonography an average age is derived at based on measurements such as sac size and length of fetus, which in her case is 6 weeks. this will be her true gestational age, to be referred to through the pregnancy.

The last menstrual period date is considered as the first day of pregnancy and hence this is week 8.