Anyone experienced this? IB?? 9DPO

Had this for around 3 days now. Had mild cramping this morning also. AF isn’t due until next week. Not sure whether it’s come early however his has been happening since 5DPO. I am now 9DPO. 5DPO I had the tiniest bit of pinky red in my knickers, now it’s turned brown? Anyone experienced anything like this?