The following table shows how I converted ranges of numeric grades to letter grades last time I taught this course. The actual conversion this semester will not be exactly the same, but is likely to be similar, so you can use this table to gauge how you are doing. Please also feel free to talk to me in person about your likely grade any time you want.

Here's the table. In general, the numeric grade on the boundary between two ranges converts to the higher letter grade, which is why I use half-open interval notation to describe the ranges.