feeling weird

Last night I had horrible back pain and normally I go to sleep and it goes away but I woke up this morning and haven't gotten out of bed because my whole body is aching!! Idk how to explain it but I just feel Yucky. I'm 38+4 weeks I haven't had any contractions today and haven't lost my mucas plug but could this be a sign i might be getting ready to go into labor soon? I've just never felt so tired like this before!