Measuring right on track, does this mean she'll be in longer?

This is a dumb question but, at my last appointment @31 weeks 1 day when my belly was measured it was right at 31.. and now I'm pretty positive I will be pregnant forever 😔😔. Does this mean she'll most likely stay in later since she's right where she needs to be? I think when the woman is measuring bigger the baby comes sooner, right? Ftm & I'm so ready for June 7th. I'm over being pregnant.