Miguel O'Hara was a very successful guy and of course, had a lot of money. So he did what most rich people did; he went out with his friends, spent a bunch of money to get drunk and ended the night off with sleeping with some random stranger he met.

You ended up being that person he slept with. And that's how he found himself standing front of you, in the middle of his office, your pregnancy test in his hand. He had somehow got you pregnant.