I'm 31 Year Old Female. I Just Got Back My

I'm 31 year old female. I just got back my blood work and urinalysis and everything was fine except for my AST:50 and my ALT 91. I'm very nervous of what this could be, should I be concerned? I've had the Hepatitis B vacation. I work in the medical field but I don't think I've been exposed to hepatitis C. I don't drink, only on occasion and I have never smoked or used drugs. I am 5'2" tall and 175 lbs. My doctor said as a precaution she is having me test for hepatitis and I'm getting an ultrasound of my liver and gull bladder tomorrow. I'm so scared.