To become pregnant; to carry a fetus. Used in both spoken and written Japanese (also written 身籠る etc.).
妻が第一子を身ごもったと聞いて家族中が喜んだ。
When we heard my wife was expecting our first child, the whole family was delighted.
彼女はまだ公表していないが、すでに身ごもっているらしい。
She hasn't announced it yet, but it seems she is already pregnant.
古い文献では『身籠る』と書かれていることが多い。
In old texts it is often written as 『身籠る』.