ovulation or implantation cramping

Jen
On day 21 I lightly spotted when I wiped myself for a couple of hours and never had that happen before. I read it could be ovulation or implantation bleeding. My period is due to come next week. I'm pretty sure that I ovulated already but I can have an irregular cycle sometimes. Has anybody ever spotted when ovulating or was this implantation.?I'm hoping for a pregnancy