怀 + (Modifier) + 孕
怀孕 (huáiyùn) is a separable verb meaning "to become pregnant" or "to be pregnant." Because it is a separable verb, elements can be inserted between 怀 and 孕, such as 怀了孕 (became pregnant) or 怀过孕 (has been pregnant before). It is the standard term for pregnancy in Chinese.
她怀孕三个月了,身体还不错。
Tā huáiyùn sān gè yuè le, shēntǐ hái búcuò.
She is three months pregnant and doing well.
朋友告诉我她怀孕了,我们都很开心。
Péngyou gàosu wǒ tā huáiyùn le, wǒmen dōu hěn kāixīn.
My friend told me she was pregnant, and we were all very happy.
她怀孕的时候还在坚持工作。
Tā huáiyùn de shíhou hái zài jiānchí gōngzuò.
She kept working even while she was pregnant.