I get them from about 8dpo which is annoying and relieving. Annoying cos they hurt. A lot. They begin with 2-3 days of low down backache then swap to 2-3 days of full on cramps. They're relieving in a way cos it means my tww is more like one week wait cos I know when the cramps start af is en route and I haven't got upduffed this month...
Just trying to work out what's 'normal' and if anyone else gets them this early and no it's not implantation, I just know its not!