If you're adequately introverted/shy (which is me, most of the time) or just feeling tired/exhausted/drained (which I imagine is not atypical for expectant moth

If you're adequately introverted/shy (which is me, most of the time) or just feeling tired/exhausted/drained (which I imagine is not atypical for expectant mothers), then I can understand not having the energy to ask something of a stranger on the train.