I had terrible stomach pain this morning...What could it be?

I work up at 6 feeling like crap, I felt nausea. I couldn't lay on my back or left side, only on my right. When I walked it was worse, the only thing that made it feel a little better was slouching over. It hurt so bad I wanted to cry. I ended up dry heaving a few times, went back to bed and woke up at 11 feeling better, just hurts a little now. It felt like really really bad hunger cramps. This is also my week for my period, but haven't started cuz I'm taking the active pill and stepping my period this month. could that be a reason?