So I know that Plan B can mess up several of your cycles/periods but as for side affects, should I still be experiencing them 12 days after taking the pill?

I started bleeding 3 days ago, 4 days before when my period was supposed to come.

The first day I bled extremely heavy with lots of blood clots then the second day I bled normally, the third day I also bled normally until the evening when I abruptly stopped bleeding until the next day(today) around noon when I bled very lightly with brown on one side of the tampon & bright red on the other all day until earlier this evening when it abruptly stopped again, the brown looked how it normally looks when my periods end. My periods are usually 6-7 days.

I've had a headache every single day since I took the pill, fatique, nausea, sweating but being freezing and mood swings.