Constant cramping one month after EC

In the beginning of December, I took Plan B. Had some cramps, sleepiness...and my period started on time. Everything was normal. My period is due on Jan 17thish and for the past week I have had constant cramping. Constant, achy and sometimes sharp pains.

1) could be Plan b aftermath screwing with my hormones and cycle, but it has been over a month since I took it

2) odd implantation cramps ( seriously doubt I’m pregnant)

3) Rough sex ( ehhhhh doubtful)

4) monster killer PMS 😂 that I have never had before. Normally cramp on day one and two.

Anyone ever experienced this?