Spotting cd 9

My period was 2 days late. Due on 5/3. BFN on 5/4. It came on 5/5 and I had some cramping that morning but it was a very short period. Only had to use tampons for 2 days and then it went to spotting. I usually have 4 day periods. Now it is CD 9 and I have light pink spotting. I don’t usually ovulate until around cd 22-24. Any ideas?