Girls only! please help:]?

umm.. i'm really embarred to ask this to my mom. actually i'm embarred to ask it to anyone. My mom told me i'm gonnna have to get my " thing" checked since i just got my period. & thats all she said. I'm really scared.. i dont even want to go to my doctor's appointment. What are they going to do?? R they gonna like stick something up inside me? Will it hurt? Pls answer! i'm flippin out here!