Perhaps a dumb question, but how exactly does an abdominal pregnancy occur? The Wikipedia page is really unclear. The text sounds as if this can happen without a rupture to the uterus or a fallopian tube.
This makes abdominal pregnancy without something rupturing seem a lot more plausible.
Found this, hope it helps. 'Typically an abdominal pregnancy is a secondary implantation which means that it originated from a tubal (less common an ovarian) pregnancy and re-implanted.' https://en.wikiversity.org/wiki/WikiJournal_of_Medicine/Insi...
"An ectopic pregnancy occasionally aborts backwards down a tube, or bursts out of it without killing the patient, and embeds itself elsewhere in her abdominal cavity. Sometimes, an ovum is fertilized outside a tube on the surface of an ovary, and then implants itself in the abdominal cavity. ... An abdominal pregnancy is thus a rare complication of an ordinary ectopic pregnancy"
https://web.archive.org/web/20170814131930/https://www.meb.u...