The problem is that most X-ray clinics do a very poor job at taking a HSG , because they try to cut corners. Many radiologists are not comfortable doing a vaginal examination, and are quite clumsy at performing the HSG. Even worse, they only take 2-3 films, and don't bother to take a delayed film, which means it becomes very hard to interpret the images correctly. And because it's such a painful procedure, we don't want to repeat it again !
Also, please understand the limitations of a HSG. We can make out if the tubes are open, but we cannot determine if they are working properly or not. Similarly, we cannot determine if there are adhesions outside the tubes - and we shouldn't be trying to guess either !