Cervical mucus & infertilty? My dr suggested us trying an iui due to my cervical mucus not being right to concieve. I was on estrogen to try & help with this issue & no results. I have heard of using plain mucinex. As guaifenesin loosens mucus, so does it really work to loosen cervical mucus for infertility issues? Or has anyone ever tried anything else for this issue that was helpful. I hate to spend $250 a pop for an iui if I can get pregnant without an iui...