Flat is not the shape of a womb, but the Bible tells us earth is the shape of a womb:
Job 38:8 ESV - Or who shut in the sea with doors when it burst out from the womb,
Job 38:8 ABP - And I shut up the sea with gates, when it was led irresistibly [out of belly its mother's going forth].
(Debunks the FE claim of no sphere in the Bible - "belly" is derived from G2836 "womb" and H7358 "womb", which is actually spheroid in shape)