Could this be implantation bleeding?

Dee

So the app says that today I’m 9 DPO, I’ve been cramping for the last 3 days. I don’t have any of the other symptoms like sore boobs just cramping and slight back pain and some bloating not extremely nauseous. I’ve been anxious to test and did so this morning using a first response test but was negative. AF due on Tuesday 1/29. Has anyone experienced this and resulted in a BFP? Thanks!