H scope?

Whitney

So I am going in Friday to have another saline sonogram. My first fet in February had failed and I had a lot if spotting so my doctor wants to recheck everything. When I called to schedule the nurse told me she saw on my chart a possible “h scope” was noted depending on the saline sonogram results. (Ssg test was fine last summer) I have no idea what an “h scope” is and im feeling super anxious about it. Can anyone give me some insight? Thanks.