Yes I read a article that says as long as it has guaifenesin it will help with he lining especially with users of clomid.
"If you re taking Clomid (clomiphene citrate, Serophene) as an ovulation inductor, it may help to know that it can cause hostile mucus in 30 percent or more of women using it. Higher doses of Clomid tend to be more associated with less cervical fluid and a thinner uterine lining, than the 50 mg dose and Robitussin can help to reverse this." - babyhopes.com article
I got mucinex instead since they only had robitussin PM.
im not expecting it to do much but im going to give it a try. My body usually develops my lining by itself. im just being hopeful it does this time around.
the blood test on CD21 is to confirm O?
Im guessing just in case, I didn't ask she has her methods and beliefs. right now im trying to do whatever it takes.