This study is a prospective, randomized trial of women undergoing HSG as part of their infertility evaluation. At the time of scheduling, the patient will be randomized to either the cervical vacuum cup, balloon catheter (H/S catheter set, UA Medical, Biotech America), or the acorn-tipped cannula using stratified blocked randomization. 100 subjects will be randomized to one of the three cannulas. Patients will be stratified into 4 groups representative of the four reproductive endocrinologists in order to overcome any potential interoperator bias.