My own opinion is different cos Hsg actually helped me and my sis,I did the first hsg which showed that my both tubes are blocked I didn't believe it so I went for a second one to be sure and it also showed that all my tubes are blocked then I believed it but surprisingly some month later I was pregnant and I was now wondering how but I later got to know that if you do it for like twice or thrice it help open the tube if the thing blocking the tube is not much the process of pushing the saline.