Chemo or no chemo

i was diagnosed with stage 2 LMS 5 weeks ago. Surgery was 4 weeks ago. Large mass was removed. But they also found a small nodule on the stomach wall. It was not connected to the large mass. Both were removed with clean margins. Dilemma is s how did the nodule get there?  From touching the large mass or from metastasized cells in my blood. Doctors are split on chemo or just monitoring. Anyone else had this dilemma?  Any advice?  Thanks