My total bilirubin count is 1.8mg/dl. What type of jaundice could this be?

Any. Hemolytic jaundice and Gilbert's feature mostly indirect. Cholestatic jaundice features mostly direct. Hepatocellular jaundice features a good mix of both most of the time. If you're otherwise well, your physician will first question you about past chemical profiles and whether you've become a bit yellow after you miss a few meals -- that would point to Gilbert's. If not, it's a workup.