Cramping is getting me down

Louisa
I'm due af in 4 days and I'm 10 dpo and I've had enough of this cramping I've never ever had anything like this before an af before it's been constant for 3-4 days now it's like I have a heavy period but nothing is there obviously because I'm not due its so painful. Has anyone had this could it be implantation ? Please help its making me feel run down