I took mucinex pills starting on CD9 b/c clomid is supposed to make your CM really thick and "hostile".. and the mucinex or robi should thin it out. I don't know if it worked or not but I did have a lot of CM this time around and am still having it now on CD20. I will definitely be taking it again next month if I'm not knocked up.
Good luck! I think every little bit can help!