Implantion bleeding and cramping.

My cycles are usually 26-28 days. My lmp was 12-12-18, and lasted 5 days. I had some light pink spotting on CD 19 (12-30-18) of my cycle. I noticed it when I wiped & that was it. Nothing since.. Then on CD 20(12-31-18) I had some cramping on the left side of my lower abdomen. It lasted until the next morning & hasn’t came back since. I’m currently on CD 28, and AF due to come today, and hasn’t shown up yet.

Could that have been implantation?