My daughter also tends to have a lower FC - her highest has been 480 but she has been in the 200 range many times. Her scopes at diagnosis showed ulcers in her colon and inflammation in her
terminal ileum. Biopsies showed chronic inflammation and
granulomas - it was a clear Crohn's diagnosis.
People with ileal (small bowel) Crohn's disease tend to have lower Fecal Calprotectins than those with colonic disease.
I would also ask for a pillcam or MRE to check your small bowel if scopes come back clean.
Crohn's is a tough disease - everyone presents differently. My daughter only had abdominal pain, some constipation and weight loss when she was diagnosed, no diarrhea or bleeding. We were shocked to find out it was Crohn's.
That said, IBS can also cause pretty nasty symptoms and can really make you miserable. It doesn't cause damage like Crohn's, but it can still really impact your life. There are a few IBS meds you can try plus diet changes IF that is what you have.
Hang in there and good luck!