Plan B

Jayy

So about a month ago I took a plan b and had just finished my period, my period ended up starting again about a week later and ended after twelve days, it’s now been about 3 weeks since then and I was supposed to get my period about 5 days ago, I have been cramping and my breast were really sore for about a week but I still haven’t got my period and am still sexually active, should I be concerned?