For me, I wasnt really told a reason, just general things that can cause an ectopic. Like pelvic inflammatory disease, which is infections of the pelvic area, such as chlamydia, gonorrhea, etc.. I still wonder what could have caused it for me, and what scares me is that if it was indeed an infection, how do I know that my remaining tube wasnt affected as well? Im starting to try again and I guess this is why all these questions are popping back up in my head.
I've started a group for ladies who have suffered ectopics: Welcome here: http://www.cafemom.com/group/rachesgroup