Help!! Labor Pain?!?

Su
Hey everyone ! First pregnancy here, So I'dk what to expect! I'm 38 weeks preg..I have Uterus Didelphys. . 2 small uteruses, 2 cervixes, n 2 vagina holes. . Anyway these past few days I've been having the worst cramping Pain Ever! ! Feels like my uterus is about to rip.. i'dk if babies hitting certain nerves or what. I only get some relief when I'm sitting or laying! My question is.. did any if u get bad Cramping in your pelvis/uterus a few days before delivering? ?