Listen to the voices.
Could you be so trusting of a voice that you are strongly inspired to be a 'stand-in' father, knowing that your fiancée is pregnant by another.
Many men do become 'step' fathers and they only need to look at Joseph as a great example.
So listen to the voices, what are they asking of you?
O Sacred Lord of ancient Israel, who showed yourself to Moses in the burning bush, who gave him the holy law on Sinai mountain: Come, stretch out your strong hand to set us free.