Sharp stabbing pains in the middle and upper right side of my chest?

For 2 days now i have been having really bad sharp stabbing pains in the middle and to the right of my chest... It doesnt stop it is constant, and hurts really bad in that area if i eat drink sneeze cough or even breath... I dont undertand whats going on its all in the upper area towards the middle of my chest by my breast .... I have a doctors appt friday, and if it matters im 5 months pregnant... Thanks guys
 
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