Cervix length in pregnancy?

i had a 20 week anatomy scan.. it lasted like 20 minutes. i found out the gender ( a girl ) and i went to see my doctor after. she ordered another one because she couldn’t get heart pictures and then she said “ then there gonna check your cervix to see if you can hold the baby “ she didn’t tell me any of my baby’s measurements or my cervix length.. should i be worried?? should i call and ask about my cervix length tomorrow? ( it isn’t open today ) i have a appointment in 8 days