BFN 4 days after implantation

I had what I think may have been implantation bleeding 4 days ago, which was cd22. I have extremely irregular periods. I woke up with very pale yellow/pink discharge which turned to pink blood, but only for half a day. Wasn't enough to even show on a pad! It was only when I wiped. 4 days later I'm still getting negatives... am I just getting my hopes up? I can't say for definite if it was IB but I'm hopeful 😥 anyone had a positive later than 4 days after? 🤞