Ketone Levels - Starvation Mode?

Good morning, All.  Posted in the Keto diet forum, but this one seems much more active.  I am new to the keto diet - day 9 today.  I lost 7 lbs my first week which I was happy about.  I am a 5’ 10” female now at 164 lbs and also quite muscular.  Anyways - I purchased a breath ketone meter, and my ketone levels have been consistently over 4.5 mmol.  In fact, the last three measurements have been in the “starvation mode” category and my last measurement this morning was actually 9.55 mmol!  It says to seek medical attention at 10 +, so I’m a little nervous.  I am working out and have found my normal workouts quite hard to get through.  Also, I do have hypothyroid, so am taking Armor thyroid to treat that.  Should I be concerned about these levels?  What do they mean?  Should I do anything differently?  Thank you!