Actually one of my good friends, when we were in college and 20 or so, was hanging out non-seriously with her ex-boyfriend. She could not stand him for the most part, but she did not mind, you know, his body. Not using any BC, she got pregnant, and as is a tradition still in many countries (I come from Eastern Europe), she got married to the guy, which I was telling her not to! Lo and behold, she dropped out and then she was divorced just a few years later. She met a guy of her dreams a few years back, got married, is back to school, but is having now fertility issues, life is bizarre.
I was always telling my parents I would never marry someone just because I was pregnant. We can definitely do it after the baby is born, if we still feel like it. Looking big in my dress, not being able to drink, not for me, people!! And definitely not the main reason to get marry, duh.