Robitussin SILLY! But it have to ONLY have Guaifenensin as the active ingredient.

It makes your CM good for the sperm to get to the egg.
Yes start temping tomorrow. But make sure you set an alarm to go off earlier than you normally wake up. So you know you won't wake up before that. Mine goes off at 7am...but I am NOT a morning person. I would sleep till noon everyday if I could.