How do I know if I have hyperemesis??

Cortnie

I'm 14 weeks today and I have lost 10 lbs so far. I don't vomit every single day, but on days that I do I can't stop vomiting. Every single day whether I vomit or not I'm nauseated the entire day and nothing helps. I'm having a hard time eating much at all. Is this HG?? I read that if you are loosing a significant amount of weight that it is considered severe, but I'm no expert. 2nd pregnancy and I lost 20 lbs with my 1st.