6weeks pregnant

Aiyoh, don't worry lah, at 6 weeks it's actually quite normal if they can't detect the heartbeat yet, depending on how they're checking (abdominal vs transvaginal scan makes a big difference!). A few of us tried, and the doctor said it can show up anywhere from 6-8 weeks depending on your dates and the type of scan, so they usually ask you to come back in 1-2 weeks to check again, my friend went back at 8 weeks and everything was perfect. But honestly, since you're worried, best to just confirm with your doctor lah about when to do the repeat scan, because they know your exact situation and can put your mind at ease properly.