Sabar ja dulu, babe, 8 hari late memang boleh jadi normal je especially kalau period mu memang irregular, tapi with the gastrik issue and cramps yang lama-lama, might be worth doing another UPT in a few days or just go see your doctor to be safe. A few of my mum friends pernah experience irregular periods campur gastrik problems, turned out it was stress, hormonal imbalance, or even something simple yang kena settle je, so don't stress yourself lagi, just get it checked out properly so you can have peace of mind! One negative test doesn't rule out pregnancy 100% especially if you tested too early, so if you're really worried, GP visit is the best bet.