Ah yes,

pregnant (comparative more pregnant, superlative most pregnant)

1. (not used in the comparative or superlative) Carrying developing offspring within the body.
2. Having many possibilities or implications.

Synonyms

• (carrying developing offspring):
  • (standard): expecting, expecting a baby, gravid (of animals only), with child, fertilized
  • (colloquial/slang): eating for two, having a bun in the oven, in the family way, knocked up, up the duff
  • (euphemistic): in an interesting condition
• (having many possibilities or implications): meaningful, significant

[ pregnant - Wiktionary ]

Up the what? Apparently UK slang. I'm sure there is more ways than this to suggest that someone is preggers.

There are a number of colloquialisms for pregnancy, usually regional. The action of impregnating a woman or girl is called 'knocking (her) up' in Canada and some parts of the U.S., and the state of being pregnant 'knocked-up'. The term 'lady-in-waiting', meaning a pregnant woman, is used broadly in the U.S. The word 'gone' or 'along' is used to represent gestational time, e.g. 'she's really far gone' or 'about 6 weeks gone' or 'six months along'. In the southern U.S. the euphemism of a water well is occasionally used to represent pregnancy (e.g. 'drink out of the well', to become pregnant), and a baby almost ready to be delivered is 'on his/her road'. Eastern Seaboard slang describes the woman as being 'in a fix' or, occasionally, 'preggers'; the Southern U.S. equivalent is 'in the family way'. An alternate term not slang or colloquial is 'with child'. 'Having a bun in the oven' is another frequently used phrase to indicate that a woman is pregnant. In Australia, it is commonly held that a pregnant woman is "up the duff".

[ Wikipedia via Answers.com ]

That cleared that up, espeically that "drink out of the well" bit that makes no sense...