Hi ladies I'm a first time mom. I'm 36w4d nd the last time I went for an ultrasound was to see the sex of my baby. I want to know how big is my baby is but when I ask my dr if I can get an ultrasound she says they only give appointments for ultrasounds if they feel if its needed. So my question to u guys is am I goin to get an ultrasound sooner down the road befor due date to know the length?