If you're facing in vitro fertilization or other assisted-reproduction procedures, managing stress and staying optimistic can boost your chances of becoming pregnant. In a University of California, San Diego, study of 151 women ages 26-49, those who felt the least optimistic and most stressed by life events other than their infertility treatments when they began them were 93 percent less likely to give birth within five years. Some tips: Seek counseling, join an infertility-support group, exercise regularly and practice relaxation techniques.