2 or 3 years ago and before then I use to have 7 day periods and now for 2 or 3 years I’ve been having 5 day periods

And now last month I had my period Monday to Thursday (4 days)

And this month well…let’s just say im used to having my period late and neevr come on Saturday or Sunday like it used to start on Saturdays years ago and now it starts on Monday’s always for my 5 day periods but last month was weird for a 4 day period especially considering I’m 18 and will be 19 on January 31st anyways today is Monday…no period yet 4:41 pm I’m now having this

(Pics below)

What do you think this is??

By the way I’m having extreme cramping?? Worst I’ve ever had.

Keep in mind had plan b on 13th of January and had my ovulation on….

January 5th till the 11th

(January 10th being the highest ovulation day)