35 weeks pregnant masakit na balakang

Hello mommies mag ask lang po ako nasakit sakit na po kase ung balakang ko at lower back tapos ung pakiramdam ko is para akong may Dysmenorrhea this is my second time being pregnant. Hindi ko pp kse na try to sa first born ko ask lang pp ako if this is a early sign of labor or false lang sya? I am 35 weeks pregnant po as of now. Thankyouuu