Laura and hunky Red-zone guy
Laura and hunky Red-zone guy will share an intimate moment, and they will bang.
She will get preggo, but since she and Ben are doing it all natural she will think that the odds are in Ben's favour about him being the father.
Ben however is taking birth-control to make sure Laura doesn't get pregnant, so he will start to dubt her, or he might even be so stupid that he thinks it's his and he will have to stay with her and can't escape with Elena like planned.
Just my guess.
X ~We are the people our parents warned us about