What is It?

Okay. So today is peak day in my ovulation. My fiancé and I have been TTC for about three months now. This past month we've been really monitoring and are at least trying to do it every other day, especially this week. Today when I was at work, I suddenly got horribly sick. I got really hot, super dizzy and shaky and I started cramping. It was the same exact thing that happens when I start my period, but obviously it's a while out from that so I'm not entirely sure what it was. Should I be worried or possibly getting my hopes up? Any advice would be absolutely wonderful. Thanks all. (: