On the show “Eight is Enough”, actress Susan Richardson (playing Susan Bradford) became pregnant shortly after her character became married. They had to shoot her only above the waist until scripts were hurredly written about her getting pregnant. Oddly enough the producer apparently had strongly suggested the character get pregnant soon after the marriage.
Yes, in their spin-off series, “Thomas and Sarah.” The whole first episode of that is a fake-out: we see Sarah with a baby, which we assume to be hers. Since she left Thomas before their baby was born, he also assumes the one she’s taking care of now is theirs and carries it off out of the perambulator to try and get Sarah to come back to him–only, as Sarah explains once she catches up with him, it isn’t. Their baby died, and she’s working as a nanny. He’s just kidnapped someone else’s child. Oops!
Sarah miscarries again later on in another episode. The poor woman never has a child that lives.
This was my favourite pregnancy write-out, partly because if it’s the same as the British version of that joke (What’s the difference between marmalade and jam?) it’s not even *that *offensive… 
But also I thought it was just quite brazen yet effective.
When Days of our Live’s Allison Sweeney got pregnant, a storyline was written whereupon her character Sami Brady had to disguise herself as a man named “Stan” A male actor who looked like Sweeney was hired to take her place.
I am not making this up.
It was weird they didn’t write the pregnancy into the story line, as Sami goes back and forth between Noble Wimp Lucas and the Evil EJ, having had a son by Lucas, then boy-and-girl twins (son by EJ, daughter by Lucas), and lastly a daughter by EJ.
Is it I can’t marmalade my dick up your ass? Because that’s the punchline to the peanut butter version