Hi. I am sorry that you are having problems. I had an endometrial biopsy about 2 months ago due to abnormal bleeding. I am 30 years old. For me, the procedure hurt moderately, but I know women who experienced much more pain, and my own mom had one once and it didn't hurt her at all. In fact, she said it was just like a pinching feeling. I think if you had children, the procedure might hurt less because your cervix is not as tight. During he biopsy, my doc said that most of the cramping comes from opening the cervix with the tube. You could have missed the cathader if you were nervous and not watching the doc. He probably did everything really quickly. When my doc did mine, I saw him place the sample in a small jar filled with a preservative liquid. Did you notice anything like that?
Good luck.
I would certainly hope that he did not "pretend" to do an endometrial biopsy. I have had two done. The first one hurt like heck but the 2nd one was more of a pinching. Who knows why? Hope you get your results back soon and can find out what is going on.