It is bad to lie to someone about birth control.
Fiona is worried that her boyfriend is bored with her and is planning on leaving her.
Fiona wants to keep her boyfriend.
Fiona discusses her fears with her boyfriend.
Fiona pretends to still be taking her birth control but has actually stopped.
Fiona discovers where she stands and is able to make decisions about her future based on that.
Fiona gets pregnant but loses her boyfriend when he finds out what she has done.