I was just looking at my husband's underwear on the floor LEFT AGAIN, and thinking how silly that a divorce that I am aware of is (on the surface) based on disputes like this. I would never let that end my marriage, but I don't REALLY think that is what ended the other marriage either.
Marrying young because someone got pregnant is NEVER a good idea. There needs to be something else there, and you can't just convince yourself that it is there to make a bad decision seem good. There are times that the two go hand in hand, but not often, and normally preclude a long term relationship that was not in the process of ending was before the "surprise".