Julie has made the decision of keeping the baby, and is therefore at her 12-week scan, still unsure of who the father is. It might be Jacob (her ex-boyfriend), it might be the remains of her and Jespers relationship (season 3, "31"). She decides to reveal the news to both potential dads, and it all - very inconveniently ends in somewhat of an awkward love triangle and a competition of who might be the best dad.
—Sophie Kampmann