I think part of what happened, when I bounced* off the concept, is three-fold, one, in that I tend to prefer MPREG stories where MPREG is a giant WTF of impossibility, instead of something people are on the lookout for because it is either normal or because the characters knew something weird/alien/magical had happened and were waiting to find out what the effects were. (Basically "I didn't know I was pregnant!" but with dudes.) Second, the first time I started to write fpreg it was for a relatively realistic fandom (Grey's Anatomy) and when I was trying to think of how the characters would think about what had happened, and I figured that roofies was the natural conclusion in a world without magic or weird alien tech. And also, too many years of X Ray techs asking if I was really, really sure I wasn't pregnant, even though I am a giant lesbo who hasn't had vaginal intercourse with a dude in literal years.

But, yes, I will tread more willingly into fandoms where magic/aliens/SCIENCE! are givens, and see if I get the same feels.

*by bounce, I mean I thought about the idea and then avoided stories with the label, not objecting to it