Help?

So last Sunday 4/7/19 I took a plan B after unprotected sex with my fiancée. My period was 3/30/19-4/2/19. I’m now in my “Ovulation cycle”... for the last three days I have had really bad cramps, headaches and as of yesterday I started spotting and throwing up. Today, I have a light flow of bleeding. Anyone know what it could be? Should I go to the hospital?