After submitting a form and moving to a new page, should the back button take you back to a blank form?

Imagine a web app page which shows all your recently submitted expenses (Page A). You then click the primary action button "Add a new expense" which takes you to a form to complete (Page B).

After completing the form you choose to "Save and view expense", in which case you go to a page showing all the details of the expense you just added (Page C).

In this situation, would clicking the browser back button usually take you to a blank "Add a new expense" form (page B), or take you back to the original screen showing all your expenses (Page A)?