Implantation cramps or period coming soon?

So , I took plan B in January and my period lasted 3 weeks.

It’s now February and my period is super late. I know plan B can throw off ur cycle and that’s what I’m thinking. But I’ve been having period cramps. Like 3x now I’ve experienced them but no blood?

Id like to say its my period coming but my cramps haven’t been days in a row. It’s been like a week apart and days. Not consistent. And it also doesn’t even last long. Like maybe an hour

Opinions? ( legit feels like I’m getting my period tho lol. I go to the bathroom and nothing is there)

Can’t tell if it’s you know what or effects of the plan b.