M.S.
It can happen, my friend's sister had tubal ligation and the husband had a vasectomy a few years before..........she was quite overweight, was not feeling well, gaining more weight, having stomach and bowel issues, felt like gas movement, so went to the Dr., the Dr. insisted she have a pap smear, did exam.......she was six months pregnant and was feeling the baby move. The lady was 43 at the time, the kid is now in his teen's. Big shocker for them and this was her first and only child.