Is my AF on the way?

Ciara • Im 24 and TTC baby number two.Already have a handsome boy who is 2years old :)
My AF should arrive in 6 days(hopefully stay away) and I am getting dull cramps in my lower abdominal and backache...I get cramps and backache when AF is on its way but usually 2 days before. Any one experience this before,I hope I'm not out this month :(