Aww sis, I totally understand your worry, pero please check in with your OB muna bago subukan ng kahit ano, ha? At 38 weeks you're technically still early, so your doctor can best advise kung ano ang safe for you and baby.
A few of us mums have found na regular walking, staying hydrated, and pelvic floor exercises helped, but honestly every pregnancy is different, important talaga na cleared ng doctor mo muna. The two EDD dates aren't uncommon din (LMP vs ultrasound), so your OB will have the full picture. Trust the process, mama, baby will come when ready! Kaya mo yan!