Dear smjpain: It would be less common for intercourse to have broken the suture line at the back of the vaginal cuff--unless there was already a breakdown/infection of the suture line. The spotting could be from either traumatized vaginal tissues or granulation tissue at the back of the vaginal cuff.
Gosh, we hope you don't have appendicitis. That would be the ultimate irony to have to go back in for the appendix after your complete hysterectomy.
I also appreciate your insight that you thought things were better because of the prescription pain medication. Now, after attempting sex you must really have total pelvis pain.
Let us know what happens after your visit.
Yours,
Jane