Don't eat lots but haven't had a bowel movement for almost 3 days now. is this an issue? can't be normal?

BM: it is normal to have BM after2-3 days, if you eat small meals

Constipation : While there can be a lot of variability on how frequent someone poops, at the 3 day mark, it sounds like you're constipated. You should focus on staying hydrated, increasing your fiber intake, keep active and consider an over the counter laxative like Senna. If you start developing abdominal pain and nausea/vomiting seek an urgent evaluation to make sure there is no obstruction going on.