Due date change?

Ali • Full-time student working on my RN-BSN while expecting baby number 1! Due July 2016! ❤️
Does your due date usually change a lot from the estimate from apps? I'm estimated being due 7/8/16 based on my lmp, and can't get into my doctor until 12/2, and even that appt is just a group appt with lots of info, and a blood and urine test. Won't have an ultrasound until 12/21. :(