I think the most common sign that you might be pregnant is a missed period. Also, many women experience breast tenderness and this odd fatigue - a feeling of being exhausted for no explicable reason. That being said, a lot of women think they have the flu or something, especially if there is nausea. You could probably get away with Lois being a good two to three months along before she thinks that she could actually be pregnant, blaming her symptoms on a strange illness. She'd have to have fairly eradict periods, though, so she wouldn't be surprised that a couple had just never shown up <g>.
As for the feeling the baby move, that doesn't occur until well into the pregnancy, even after a woman begins to show. By the time you would feel the baby move, you would most definitely know that you were pregnant.
Hope that helps.
Lynn
