Seconded! If you don't mind a rec, try this one: http://archiveofourown.org/works/4082506/chapters/9194662. This is a very realistic take on MPreg! And the pregnancy is a result of Sherlock being Sherlock, as someone wrote in the comments. The story itself is super interesting.
Re: John/Sherlock. Mpreg, but no omegaverse. Pregnant!Sherlock.
If you don't mind a rec, try this one: http://archiveofourown.org/works/4082506/chapters/9194662.
This is a very realistic take on MPreg! And the pregnancy is a result of Sherlock being Sherlock, as someone wrote in the comments. The story itself is super interesting.