39 weeks no sign of labor and closed cervix

Hi mga mamsh, 39 weeks na ko today pero no sign of labor and closed cervix pa rin po. EDD ko is August 02, pinababalik po ako next monday Aug. 2 for check up ulit and ultrasound tsaka pa lang ako reresetahan ng pampa open ng cervix, Ask ko lang po if pwede na ba ko magtake ng primrose kahit di ko na po hintayin next check up ko or any advise po para mabilis mag open cervix. Thanks po. #firstbaby #pleasehelp #1stimemom #advicepls