Alamak, I understand you're worried lah, tapi from what you described, your doctor dah explain which is good! A few of my mum friends went through similar scares during early pregnancy, and honestly 1cm is still very small, so don't stress yourself too much first. Since you're 8 weeks, no pain, no bleeding, and your doctor said it might resolve on its own, I'd just follow their advice and go for your next scan, they'll monitor it and let you know if it needs a referral to O&G. For now, rest well and avoid anything yang buat you anxious, okay? Keep that follow-up appointment and don't Google too much, because early pregnancy scans always show weird things that turn out fine.