is it ok if i didn't do a CAS ULTRASOUND..

because some clinic won't accept me anymore because im 29WEEKS PREGGY.. THEY SAID MY BABY IS BIG ALREADY.. 🙄 but im worried what if he/she is not fully developed or u know some prob when i give birth to him.. 🤦‍♀️🤦‍♀️😞😞😞😞 im so sorry im really worried... pls i need some opinions and answers pls