When my doctor told me I was measuring just a little over 38 weeks, instead of 39w+3d I kinda got…

When my doctor told me I was measuring just a little over 38 weeks, instead of 39w+3d I kinda got scared, I don't know why though but I did... Then she started talking about next visit we will talk about inducing me and I'll be 40w+3d when I go back.... Is there any reason as to why she would be talking about this now? is it because of how I'm measuring?? FTM