Eliminating worry, having sex daily and using ice packs to increase a man's sperm count are common myths associated with increasing pregnancy chances, according to Parents.com. Although many of these myths have some truth to them, there is not sufficient evidence to indicate they improve the likelihood of conception.
There are additional myths associated with increasing the odds of pregnancy, such as drinking Robitussin to thin the mucosa lining of the cervix and having intercourse early in the day with the lights on, says Parents.com. Although a man’s sperm count is slightly higher in the morning, there is no indication that leaving the lights on has any affect on conception. While Robitussin may thin mucus, this does not necessarily increase fertility.