What is FT4 low mean? Please help and if that ever happened to you?

S.S

worried! I’m 33 weeks. I told my doctor I’m always very tired and I noticed hands and ankles get swollen so she order blood work and this was the results I got and today she called me left a message to schedule appointment with endocrinology and when I called them they told they don’t have any appointments until January 2025. Is this something to worry about? What is it mean?