Not much changed after that day and a couple of days went by, King Rugalf and King Ragnar had a change of heart and included Askild in their plan.
They brought him into the fold and as they expected, he was not going on the expedition himself and would rather act as an observer. This decision was based on wanting Bjorn to partake in it and Lagertha advised him to.
King Ragnar could think of going because he knew that Lagertha was strong enough to eliminate any threat that would come forth even if she was pregnant.
There was no way she could tag along, Ragnar forbade it because they have been trying for so long for another child and the fact that she took in was excellent news.
Ragnar was not going to risk it but something did worry him about Bjorn, he did not know what his son intended to do but he knew it was something that Bjorn had no intention of backing down from. He kept his lips sealed, Bjorn must have had his reasons for not telling Lagertha.
Author here, I wanted to get straight to the expedition and skip the numerous inconsequential chapters that would lead to this day so I simply summarized it.
It saves everyone their coins and FP