It could be possible none of the main girls are pregnant, and instead, one of the guys are seeing someone new. Zoey is out of the country, leaving Luca to chase after her unsuccessfully, and Aaron is staying behind with just a kiss for reassurance. Vivek is a man of few romances but not for a lack of trying, so he might finally have someone special. Vivek is also sharing an apartment with the girls in the upcoming season, so there is a huge possibility the girl taking a test in their bathroom is a girlfriend of his.
And let's not forget about Cash, Zoey's basketball star ex who has women swooning all over campus. A baby isn't the most shocking fate for the charming athlete. While the show is hyping up the pregnancy to appear as if one of the main girls will have a baby, ultimately the writers could throw a curveball by introducing someone new to the group.