Leisa:
Do you have the top expanded? By the date in the right hand corner, there is a button. If you don't have that expanded, click on it. What it opens is another row. In that row is a place on the left hand that shows what posts you haven't read and what replies there are to everything you posted. This is the easiest way, imho, to keep track of what is going on.
Hope this helps,
Jeanne