If stress levels are high, massage therapy has been known to help. It is believed that stress hormones interfere with the proper production of hormones needed to encourage fertility. The reality is, most of us aren't under that much stress unless you have a high powered job or on your feet all the time (a waitress or grocery cashier). Its does seem to be more helpful for women over 30. Chiropractic techniques also help some. To my knowledge, no major studies have been done on either technique.