It is possible to have a bowel obstruction without Crohn's, but it's not exactly a normal event. Something had to cause it, either a mechanical obstruction or paralysis of the intestines (ileus). Either way, I'd be wanting to know what caused it.
It would be unusual to have two bowel obstructions 8 years apart in Crohn's, but it's not beyond the bounds of possibility. People can go into spontaneous remission with any drugs. If you turn out to have a fistula, that massively increases the likelihood of Crohn's.
Incidentally, it's not a rare thing for Crohn's folks to be normal or even over weight anymore.
www.ncbi.nlm.nih.gov/pubmed/23040290But by the same token, being overweight isn't a risk factor in getting Crohn's, so don't feel bad on that front:
www.ncbi.nlm.nih.gov/pubmed/23318483