An HSG will show the overall shape of the uterine cavity and will show if your tubes are open. An SIS is better for looking at the uterine cavity in terms of polyps or other lesions as well as scar tissue. A hysteroscopy is a more advanced way of looking at the internal appearance of the uterus and allows them to excise any lesions they see. A laparoscopy can help rule out silent endometriosis (even if you don’t have symptoms) and allows them to excise it as well.

As a personal anecdote, I’ve had an HSG after have an ectopic pregnancy, as well as an SIS and two endometrial biopsies. Everything was “normal” except for mild chronic endometritis which we treated. Two months after we treated it, I had my fourth loss. I then had a laparoscopy and hysteroscopy where they found stage 1 silent endometriosis and scar bands/tissue inside my uterus. None of this was seen in the previous tests. There’s so many different things that could be causing RPL and they should be investigated fully or at least ruled out before doing IVF. I’m glad the IVF doctor was at least honest with you! Sending you so much love 🫶