Glad to hear that you are thinking about charting. I'm the co-host of the Fertility Charting board, so if you ever have any questions, need help getting started or need someone to look at your chart and help you understand it... we've got loads of ladies that are really sweet and really helpful. You can click on the purple box at the bottom of my siggy if you want to check it out.
I took 2 tspns of Robitussin 3 x's a day starting on CD 10 starting 2 months ago. The only reason I didn't take it this cycle was because I didn't need it. I actually started making my own on CD 7 this time!
I wish you the best of luck in your journey and look forward to getting to know you better!!