guaifenesin. its an ingredient found in some cough medicines, i used the childrens benylin and look where i am now! trick is to take it a week up to ovulation, it thins the cervical mucus (as it does with the mucus from the cough so that it can be got rid of better hence curing the cough) lets the spermies through easier so they dont have such a struggle on!
hope ive helped.x