5 weeks 2 days ultrasound

Cristie • God Is Good 🕆 have a beautiful baby girl that is 5 years old and a handsome baby boy that is 2 & 3rd on the way ♡ and have an amazing partner 🕆interracial family ♡ insta: Cristie_leilani

is it normal not to see any yolk sack at this stage ?? i have another ultrasound next week to see how its progressing and i did have a ultrasound last friday which they didnt even see a gestational sack then so it has progressed just worried