2 periods in 2 weeks???

So I started my period 10 days ago was sooo heavy, lasted 5 days, at the end of my period I used a morning after pill and I just got my period again one day ago?? And I’m sooo tired, my boobs are so sore, lower back is so sore and I’m getting such bad cramps..what is wrong?? Surely this amount of blood isn’t normal?:(