Cramping at 5 weeks boleh normal sih, tapi since yours datang-pergi gitu, better check with your doctor atau clinic first lang, some cramps okay, tapi ada yang perlu diperiksa tu. A few of my mum friends had the same worry early on and their doctor just gave them peace of mind after checking. Tak perlu berhenti gerak langsung, but listen to your body, if it feels sharp or ada spotting, get checked asap ye!