I submitted a manuscript in a journal (Springer) and after 3 days the status of my MS changed to "With the Editor" followed by "Decision in Process" after 5 days. My MS apparently did not undergo peer-review. Should I expect rejection on this stage?
If the editor decided not to send the manuscript out for peer review, then the decision is almost certainly a desk rejection.
In theory, I suppose it might have gone out for peer review and just been an unusually speed process, but in practice that is extremely unlikely.