1. To be highly suspected amongst friends of being pregnant, but having not yet 'gone public'.
2. To be of an age and position in life where having a baby is the next logical step.
Based on the observation of the high frequency of woman tv weather presenters who were pregnant or became pregnant while in the job. Thus if someone is presenting the weather it is only a matter of time before they become pregnant.
"She's not saying it, but I reckon they're trying to get pregnant. I mean they just bought a house."