Period or not?

My period came one day earlier, it came while I had sex. I had really bad cramps. But I’m not bleeding anymore?

It was pinkish the whole time, it was a lot when I wiped. It has been really light spotting after I saw it on the toiletpaper and now I’m not bleeding at all anymore. At least what it seems like.

Can this be implantation bleeding? I thought you couldn’t have bad cramps like bad period cramps during implantation.