TMI PHOTO- Implantation?

Jess
 
​I posted yesterday about cramping/pinching on one side with a backache at 10dpo that had been going on a few days. 
​I did a CM check today after some cramping and found this. So far it just came and went, CP is med/high. AF Due 6/19. 
​I know it could be nothing but has this happened and you've had a BFN?