Could Constant, Sharp Pain In An Area Of Buttock Elevated With Movement Be Muscle Pull?

Hi, my name is Sarah, I have a constant pain in one spot in my right buttock that is preventing me to bend over and, when I m sitting and move the posture of my back, from straight to slouched, the pain is quite sharp. I have had the pain for about 2 days. If I am standing and walking I don t feel the pain, only when I am sitting on a 90 degree angle (more or less) or bending over. I have felt this pain before, but it hasn t been for this long or as severe. Not to say it is an unbearable pain, but it is worse than it has been in the past. I am hoping you can tell me if you think it is a muscle pull or something I should see a doctor about. Thank you very much, Sarah