5dpo cramping like AF?!

Meg • TTC after losing our baby girl at 37 weeks 👼🏻
Cramping and backache like the first day of AF? Anyone else have this?  Everything I read on google (I know, I know 🤦🏼‍♀️) says implantation cramping lol  
Today the cramps and backache are gone! But they were intense enough to make me go to bed early...