Implantation or AF??

Chelsea • Child of God • Wife💍• Girl Mom (x2)🌸

So my period was from 05/03-05/09. 50mg Clomid taken on 05/05-05/09. First successful ovulation on 05/15 (cd 13). AF wasn’t due until 05/30, but had bleeding on 05/23 (8 dpo, cd 21) that lasted for 3 days. My periods are usually 7-10 days at least. It stopped yesterday and I haven’t had any today. Currently 12 dpo. Could this be implantation or just early AF??