As a woman who miscarried herself (no "stress" from an ex involved) there is NO WAY to KNOW that any of a zillion other factors may not have caused the miscarriage. Woman can and do miscarry. I know many women who had at leaset one miscarriage on the way to having their eventual two, three or four they now have. My grandmother had eight, and miscarried two. There is no valid evidence a pain in the backside ex causes miscarriage.