Constant lower stomach pain for the past 4 days?

I started provera to start a period about 5 days ago. I have been having a severe, constant pain in my lower stomach all the way across for about 4 days. Could this pain my the signs of an on coming period or something severe? At first I thought it was gas but the pain has gotten much worse and constant. Any idea's? I have pcos so I really don't think it could be pregnancy.
 
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