Worried !!😥 went for a stress test

I went for a stress test and to figure out my baby girls position by ultrasound. she's head down already very low..Her heart was good and she's moving alot they said she's healthy but they told me i was measuring small. I'm suppose to be 37weeks 2days but on ultrasound im measuring 35weeks 2days and baby is 5lb 14oz. They want me to go back next Thursday for another stress test and ultrasound to check her growth. Should i be worried?? bc im freaking. im praying everything is ok with my baby girl 😟 🙏🙏