I can't remember the name of this fic! jensen is an omega who ends up mated to jared. jensen is afraid of child birth because his omega parent died while giving birth so he takes contraceptive tea that he hides in the kitchen every day to assure he wont get pregnant. The cook finds the tea and tells jared who gets pissed and switches out the tea for a placebo. jensen doesn't notice and winds up pregnant and panics... the rest is fuzzy to me.
thanks for the help!