Fundal Height Measuring Behind???

Ebony

Apparently I am measuring 27 weeks instead of 29... I am worried out of my mind as I am already high risk with a cerclage. On top of that I moved from NC to Florida and in NC I passed my glucose test but in FL it is failing.😔😔😔 Should I be worried or is this normal? This is my 2nd pregnancy but with my first they were twins so I have no idea what is normal for a single baby.