Belly measuring 1 week behind

ana

Who is measuring 1 week behind? I am 39 weeks and 3 days. The pat 2 weeks when they do the measurement I am 1 week behind. Did an ultrasound 1 month ago which baby was measuring small but told me everything was ok, just that I will have a petite baby. Also was checked and only 1/2cm dilated and 50% effaced :( Scheduled for another ultrasound in 3 days, a day before my due date, to see if everything is going well. I want to be done with this pregnancy 😡