Hormonal imbalance

I have super irregular periods so I went to my Gyno and got blood work done last Thursday. They just called me back today and said they want me to come in for a pelvic ultrasound because my “levels are out of range,” and then I have to come in a week later to discuss the results. I’m sitting here thinking the worst and probably freaking myself out more. Can someone please tell me what the possibilities could be for my levels to be out of range???