I read this can help with cervical mucus. The site I read said to take 600 mg twice a day for five days before ovulation. Just to make sure I am thinking clearly, here is a picture of my calendar on Fertility Friend. I haven't been temping or anything, so it just gives predicted fertility dates (the dark green boxes) and predicted ovulation dates (the light green boxes). Based on that, I am thinking of starting the mucinex on the 21st. Is that what you would think too?