Tiny pink spot when wiped.... Late implantation?

Please help! I've never had this before. I took clomid CD 3-7. I had a +opk on May 21st. On another app my period is due on Saturday, 2 days from now. And on her I'm due Friday, tomorrow. I've been achy, and cramping, lots of cm, high cervix. When I wiped earlier before sex there was a tiny pink spot on the paper. I checked, and no af. We bd, and when I went to the bathroom and wiped again, another tiny pink spot. Checked again, no af. I asked on a th page, and someone said it could be implantation bleeding, but this late??? Is it possible to implant this late??? Please help, with my other two kids I didn't have implantation bleeding, so I don't know what I'm dealing with! Tia!