12dpo. Still a chance?

Jessi

Got a negative today. Based on the dip in my chart that may have been implantation right? If it was I'm only 3 days past implantation. I feel like I'm grasping at straws what do yall think? I've had very full swollen tender breasts, dry mouth, headaches, runny nose, and a full achy feeling in my pelvis (sorta like when you have to pee but I don't need to). Also had really bad cramps last night and diarrhea. Woke me up at midnight. Then I was fine.