If it's the same XP each, then you'd still need to be a very prolific manwhore for the higher levels.
And if they start asking for financial support during pregnancy, you might need to resume adventuring just to afford the added food costs. Pregnant women get hungry.
Bob: "Do I see anything?"
[Rolls a 1]
DM: "You see nothing"
Bob: "Well, DM probably only said that because of my shit roll, I bet there's something here"