In most traditional comic storylines, Archie doesn't ultimately end up with Betty. Instead, his affections often shift and the plotlines keep the romance aspect quite dynamic and unpredictable.
It's not always consistent. Sometimes Betty ends up with Archie, but there are also instances where the romantic outcome is left open-ended or she might have a different partner depending on the particular comic series or story.
The pregnancy could also make their relationship more passionate in a different way. It's not just about physical attraction, but about the love they have for the life they are creating together. They might have more tender moments, like when Daniel feels the baby kick for the first time. This new shared experience cements their relationship and makes them realize how important they are to each other.
One common theme is the power of friendship. Betty and Daniel often start as friends in these fanfics, and their relationship grows from there. Another theme is the exploration of different worlds. Since they come from different backgrounds, fanfics may focus on how they bridge that gap.