I've been testing with opk's for the past 7 months and generally have short-lived surges that peak fast ( sometimes I barely catch them testing twice a day!) And then very quickly fade. Had a HSG test done a week ago and had a strong LH surge, testing positive for about 3 days! And still having strong lines after.. usually they fade to almost nothing by now. Has anyone else experienced this immediately after an HSG??? I'm hoping this is a good sign! (HSG was "normal").