Fanfic summary I just found on a rec-list:
Harry Potter is in love with Severus and Remus, who are together. Before
he graduates, Harry Potter spends the night with them. Hurt and in pain
because he thinks his feelings aren't returned, Harry leaves Hogwarts.
Harry finds out that he is pregnant. Will he tell Severus and Remus? Is
there any hope for the three men?
You got to be fucking kidding me.