First ultrasound and heart beat can’t see anything

I had my first ultrasound yesterday and she had to do an internal as she couldn’t see much, she didn’t sound positive with how she was acting and she said maybe come back in 10-14 days as it’s hard to see your very early on in 7w3d and with my other babies seen the heart beat at 6 weeks now I need to go get bloods today and Monday to see if my HCG is rising! Anyone have this or similar and turned out to be ok! I seen the sack but only a tiny dot!! I don’t know if Baby has stopped growing or I’m earlier than I am calculated! 😭