Measuring WAY behind

Hi everyone! Currently freaking out and I can’t help it. Today we had an in home ultrasound to share with the family and I received the news that baby is breech. I’m 30 weeks tomorrow. Worse than that is from the techs measurements she was measuring 3 weeks behind at only 27 weeks. I haven’t had an ultrasound since 22 weeks and last appointment I asked if i would receive one before baby was born and they told me no. If I wouldn’t have had this ultrasound I wouldn’t know all this stuff. I’m calling my doctor first thing tomorrow morning. But has anyone had this happen to them or someone they know. I hope everything is okay I’m so scared!