I have a low heamoglobin and high monocyte count. what does this mean?

Big picture: Low hemoglobin always requires a workup. It may be anything from lack of iron in the diet to replace losses from your periods to a minor hereditary item like thal minor to something serious. Ignore the percentage counts of different white cells; if the absolute monocyte count is more than 1000 (assuming all normally-formed), it might point to something but only if there are other symptoms / signs.