TMI TMI TMI Masterbate Hurting?

Michelle • love life, and life with love you back.
sorry if too much but just asking. 
so I was masturbing today and I came...
I wanted to keep going and somehow it started to hurt inside? not too high inside.
a little lower where I get cramps. 
I get my period in 10 days if that matters and I've been really dry (unless I get wet.)