Not long ago I was having sex with my girlfriend and felt my left testicle shift. I felt it and it was gone, moving into the light i saw a bump where it had gone up into my pelvis or abdomen. with gentle pressure i was able to move it back into the sack but it has not been the same since. That testicle has been hanging much lower than usual. In addition, my sack has been much looser or much tighter than it has been before. There is not really any pain which gives me hope it isn't anything too serious but i don't want to take any chances. Any ideas as to what is going on would be greatly appreciated. I have made a doctor appointment in three weeks, but am wondering if I need to see someone much sooner than that?