5 ot 6DPO with weird symptoms

so the app originally said my ovulation date was Tuesday the 24th. That morning my opk was high but at 3pm I got a peak result when I tested again. The morning of Wednesday the 25th I was still testing at peak. I had increased pain and fatigue Wednesday so I'm thinking that was the actual O day. If it was, I am only 5DPO today. This morning after waking I started experiencing mild cramping in my lower abdomin and at about 730 am I had about a 5 minute time frame where it almost felt like something was pinching me from the inside. I know things I've read said implantation doesn't happen until at least 6DPO but that's not necessarily in every woman. Could these feeling be the beginning of implantation or am I cramping for some other reason? Period not due for 10 more days