Trying mucinex this month. How much do you take a day?

Amber • After a long journey finally had our beautiful little girl! She is a year old now and we are ready to try for baby #2!
Ive been taking one pill of mucinex every day since CD 8 and I'm currently on CD14 I'm pretty sure I will O on CD 18 but so far I haven't noticed an increase in CM. What have your experiences been? Should I take more then one? Did your CM increase the closer you got to O? I'm a little worried Mucinex may not work for me! :(