Mucinex & TTC for 4 years

Kelly • Married. 4 years TTC #1. VA🍍. PCOS.
TTC (not trying but no protection) for four years. Have seen fertility doctor very on and off to run preliminary tests over the past year to get the basic questions/concerns out of the way. Nothing is "wrong" - husband has a son from previous relationship and semen analysis came back perfect (of course it's me). Married 2 months ago so I want to actually TRY for at least 3 cycles until I choose to really commit to going to the fertility doctor religiously and add that stress to this journey. Currently tracking my O, CM, C position, temp, & taking vitamins galore. First time using this app and hope someone can help. My main question is, I have noticed a substantial improvement in my CM when I took Mucinex (was sick last week) and got to reading about success stories when used to assist with CM. Any success stories for similar situations? Long time TTC with Mucinex swooping in and being the hero? How lon do I take it? How much? What time? Any advice is soooo welcome.
Trying to not overthink it all. 
Xo