6w2d Rainbow Baby 🌈👶

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Had my first ultrasound today on my Rainbow Baby🌈👶(vaginal). Measuring 6weeks 2days. This gives me a due date of May 5th I originally thought it was May 3rd The Tech couldn’t find a heartbeat says it could be because it's too early? Should I be worried? Also could anyone do any gender theory’s? Does this look normal for 6 weeks 2 days!