Another question ??‍♀️ What does the 3rd screening show? Should I worr…

Another question ??‍♀️ What does the 3rd screening show? Should I worry if the first two were normal? I'm actually nervous before each ultrasound and did unplanned ultrasounds in between screenings, but after the second screening I didn't go anymore, waiting for the 3rd screening, and I'm worried because I haven't seen it for 2 months and don't know how it is...and can you please tell me about the number of fetal waters that affect it?