The patient will then be allowed to return home, but will be instructed to remain in bed or avoid physical activity (including sexual intercourse) for two to three days, or up to two weeks.

[4] Various studies have been undertaken to investigate whether cervical cerclage is more effective when combined with other treatments, such as antibiotics or vaginal pessary, but the evidence remains uncertain.

[11] The leading hypotheses for its mechanisms were that it could help keep the cervix closed similarly to the cerclage, as well as change the inclination of the cervical canal so that the pregnancy weight is not directly above the internal os.

However, large randomized clinical trials in singleton[12] and twin pregnancies[13] found that the cervical pessary did not result in a lower rate of spontaneous early preterm birth.

Therefore, the Society for Maternal-Fetal Medicine recommendation is that placement of cervical pessary in pregnancy to decrease preterm birth, should be used only in the context of a clinical trial or research protocol.