What to expect at the fetal stress test?

ali • Wife 💍 Mommy to a beautiful 6 yr old little girl 💗 Angel mama 6/12/22 🤍👼🏻 TTC #2 ❤️🌈
I'm suppose to get it twice every week once I hit 34 weeks (30+5 today) since I'm high risk. What can I expect ? Im a FTM so idk what to expect.