There is a reason for Quinn to hide them: are sugar pills, not birth control pills. Why Quinn would let fake birth control pills in a place where another HOT could use them? Does she wants that her sisters at HOT get pregnant?
I don´t think Zoey would be interesting in pregnancy only if the father is someone we know. The interest of the story (well, it would not be interesting for me, as already said) would be to involve Tremolo in her drama of single teenager mother, since she´s both his ex-girlfriend and his best friend from childhood. Actually, the drama would have more weigh if the "sperm donor" is an unknown guy that neither is nor is expected to take care of the child. And, if it results that Zoey knows Vinnie and even has a relationship with him, I´m going to call bullshit. Where is B&R? In one of those shithole villages in the Rocky Mountains where everybody knows each other and are related or a relatives?