Reading Hcg levels at 21 weeks

Erin

Just had my quad screen come back negative but was curious about my hcg levels, which were listed as 17.86 iu/mL, which would be low just at that number. Google searches show typically they’re listed as mIU/mL and can convert as such. How would I read it as the longer number? Haha math was not my strong suit in school.