Hip ultrasound on baby

I just went to my baby’s 6 month appt on Friday & the doctor had some concerns about her hip like she has one fold on one thigh & 2 on the other & she kept moving her legs so she told me to call and get an ultrasound, I forgot to call that Friday so now I have to wait until Monday and im kind of nervous even though I’m sure it’s all ok, my baby seems fine so I won’t worry unless I have to but I just want to know if anyone else’s child has gone through this or like their doctor told them to do the same thing and what happen.