[bravefoot]

IANAD but I know the fallopian tube doesn't connect to the ovaries but instead opens into the abdomen. An already ectopic embryo could continue up the tube until it exits into the abdomen. That sounds crazy which is probably why it's so rare. Also, during ovulation, a fringe called the fimbra is deployed to essentially sweep the egg into the tube.

[dpark]

Thanks. I feel like sex ed really failed me here. I did not realize the fallopian tube didn't connect directly to the ovary.

This makes abdominal pregnancy without something rupturing seem a lot more plausible.