Annoyed/Scared

I’m 28+1 with my second child. Today I went in for an ultrasound & my dr let me know that my baby is smaller than she should be. He’s having me go into a entire different office to have another ultrasound to measure her again, this will be my 3rd time having to do this but the first time going to this specific office. He told me not to worry which I can’t help but to be annoyed by it. Like what do you mean, how can I not be worried. I know I haven’t eaten the best during this pregnancy sometimes I only eat 1-2 times a day because that’s all I’m in the mood for so I can’t help but to feel like it could be my fault 🤦‍♀️ Has anyone had this happen to them & baby come out perfectly fine ? I just need reassurance right now.