What episode does Bart get a girl pregnant?
Bart's prank calls
A Guide To The Many Loves of Bart Simpson
Bart’s Girlfriend with Mara Wilson
Beware My Cheating Bart (TV Episode 2012)
He instead confesses how their small relationship taught him not to be naïve around girls.
Eventually Marge, in a fit of rage, gives away all the spoilers of the episodes Homer has not watched yet.