3rd trimester ultrasounds

Lauren
My practitioner is not going to do another ultrasound in the 3rd trimester (unless something seems wrong I guess) and I've only had one at 20 weeks. Is this common? I feel like so many people are getting them now!! I feel like I have no idea if he is growing enough or too much or healthy.... Is this common to not get one again or is your doctors standard protocol to get another u/s? I feel like I'm getting jipped! Thanks everyone!!