Reactive nonstress test (NST):If during 20 minutes, your baby’s heart rate accelerates a certain amount two or more times, they’re considered “reactive,” meaning there’s no cause for concern. If they don’t have two of those accelerations in 20 minutes, don’t freak out. They migh...
I had an NST with my pregnancy as well, for the same reason. I didn't know they were going to do it that day and I was glad that my mother happened to have tagged along to keep me company, because it would have been a bit lonely otherwise. It's just like the fetal heart rate...