Implantation or period

Hopeful

Is this my period or implantation bleeding? I ovulated on Dec 21st. It was the most excruciating pain ever. I couldn't even touch my abdomen that night but we managed to bd. My period was supposed to start December 6th but I started spotting on the 3rd. It got a little heavier throughout the day even the second day was a mild flow nothing crazy. I passed the tiniest clots but not the typical clots you get with your period. The blood has been the same bright red and lots of mucous both days (tmi). Now it's the 3rd day and my cramps went away on the 2nd day and no cramps today. When I urinate there's no visible blood only when I wipe (tmi). Can this be implantation or just a short period?