with child

(be) with child (be pregnant) — быть беременной, в положении

Example: I heard a rumor that you're with child.

see also
[bun in the oven]

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Some more pregnancy

Some more pregnancy euphemisms:
[in the family way] (old-fashioned)
eating for two
knocked up (AmE, usually about an unplanned pregnancy)
up the duff (BrE, often about an unplanned pregnancy)
up the pole (Irish English)