TMI PIC: implantation or early af? 8dpo

Rachel
Hi ladies, on Clomid 50mg second round. I got a positive OPK 8 days ago, woke up today with strong left side twinges (like I get with ovulation) and when i used the bathroom, I wiped and got this. Is this maybe IB or could this just be early AF? My body plays tricks on me, last month I had an 11-12 day luteal phase so it was earlier than expected. Could it just be that again? I hate to get my hopes up. Period due Saturday.