Clomid can interfere with the ability of the cervical mucus glands to be stimulated by estrogen to produce
fertile mucus. Only "hostile" or dry cervical mucus may develop in the days preceding ovulation.
Robitussin may help to improve the cervical mucus. Make sure the active ingredient is Guaifenesin
only. Recommended dosages are 1 tsp, 3 times per day, CD8 through ovulation.
Pill form
(Robitussin) can be ordered:
medvitamins.com has the pill form of Guaifenesin. I got a type
called Guaifenesin 600 (100 tabs for $30 + shipping).
Some also drink green tea, & grapefruit juice to increase cervical mucus. (Start
at the beginning of your cycle until ovulation)