Hysteroscopy

Leah
Has anyone ever heard of, had experiences with or know anything about  hysteroscopy? My dr called this morning and said he was going to be scheduling me for this after having a transvaginal ultrasound last week.  
I've been looking up information online which is definitely not helping my mind from reeling.  I'm really starting to worry my chances of ever conceiving are slipping away. 
Any insight would be super. TIA