Robitussin cough syrup for TTC?

cEc!Le • L&D RN*Boy Mom of #1*Pregnant with Baby #2 which is a GIRL!!!
Anybody heard of drinking Robitussin cough syrup once a day to conceive? My co-worker said that she suffered with failed fertility treatments for 6 years and started drinking Robitussin cough syrup everyday during her fertile days and got pregnant within a month. Something about Robitussin thins out your cervical mucus which is kinda like how Robitussin works with cough thinning out mucus so that you can cough it out. Thoughts? Anybody had success with it?