Pain question! Help!

Shaina
So this might seem totally gross, I'm about 4-5weeks along.  I noticed it a little yesterday & deff today, when I go to the bathroom to have a bm I feel like a sharp pain on my left side where I'd best describe where my overy is probably located.  It doesn't really hurt any other time other than when I'm trying to go.  It scares me to even push because it feels like something's about to pop.  This is my first pregnancy so I have no idea if this is normal or not.  I go back to the doctor on Wednesday morning for my third level check, so I planed on asking then as well.  Any input would be greatly appreciated!