What are the things that hinders pregnancy?

Indonesia
@surajp (29)
September 8, 2012 11:58pm CST
There are many health factors that hinders a person to conceive and get pregnant, such as infertility, a high level of ASA (Anti Sperm Antibody). However some people tend to over look the mental state of the person. I sometimes feel that the mental state plays a big role in it. What do you think? Do you think the mental state of a person affects the chances of conception, and if so, how much?