Wah, I understand sangat la the excitement! Honestly, it's still early days at 9 weeks, a few of us moms I know had similar situations where the second sac wasn't clearly visible until closer to 11-12 weeks, so there's definitely still a chance! Your friend's experience is encouraging, tapi timing scan jugak matters (angle, clarity of the machine, position baby all affect apa yang doctor nampak). My best advice is relax a bit for now and tunggu next scan, usually by 12 weeks it's very clear if ada dua or satu je. All the best, semoga rezeki datang!