What do implantation cramps feel like/when did they occur for you?

Alli

So I’m 8 dpo today, 5-6 days before my period and i have a good amount of pelvic pressure with some mild cramping. Its been on and off for a few hours, but I’ve never gotten period cramps earlier than the first day of my period. Its making me wonder if it could be implantation cramps. I was wondering if anyone has experienced this and can shed some light?