Feel like I’m not getting the proper care

So lately my appts only consists of hearing the heartbeat, my bp, weight and seeing if I want to see the social worker. I was expecting to get my belly measured and more ultrasounds but I haven’t got one since my second trimester and I’m now 31 weeks due sept 26th. My mother and MIL keeps asking me questions regarding the appts and answering with no that’s hasn’t happened yet got me thinking maybe I should be enforcing more proper care ? I asked my doctor if she was going to measure him so we could see how big he is to help determine what clothes to get and she said they don’t do that “anymore” to just buy all sizes. Which is cool i hear it all the time but I also hear and read how moms knows the baby weighs and I just don’t have any idea about mine #firsttimemom