Would pregnancy tests be more effective if zero lines is non-pregnant, one line is a single baby, and two lines means twins?

Why do you think men and women in a dual-income, full-time family are more likely to believe that the arrangement is a financial boost compared to a family with just a working dad?
Do you believe true love happens instantly when you meet someone, or does it grow slowly through trust, communication and time? I'd love to hear your thoughts?