Growth ultrasound

So I’m 27 weeks and 4 days. Ob has me doing a growth ultrasound every 4 weeks.. but today they were unable to find her right kidney and or her right artery renal. They referred me to a high risk ultrasound tech to see if that’s really the case. It’s not until April 1st. But it’s giving me such mom guilt and such an uneasy feeling that my baby might only have 1 kidney.. has anyone else gone through this? Or even if they have mistaken only having 1 kidney till you went a high risk ultrasound tech? Please tell me some of your experiences