days ago when for first scan.need scan thru vaginal only find my baby six week..today went to second time.still same.six week 5days?

days ago when for first scan.need scan thru vaginal only find my baby six week..today went to second time.still same.six week 5days?doctor say can see the egg is lay in embryo still consider as healthy .just grow slow?ask me wait 10more days and see.im very scare don’t know what to do.hope my baby can be stronger