Okay so the red line indicates where I have been feeling a sharp pain and it hurts , yesterday I was…

Okay so the red line indicates where I have been feeling a sharp pain and it hurts , yesterday I was walking and had to stop the pain was so sharp . It's like on my waist I guess and goes to the front but mostly in the back . What could it be ? I have a doctors appointment tomorrow so definitely will ask ob . ! #help #ftm ☹️☹️☹️