Just wanted to reiterate that the assessment is screening, not diagnostic, so no, they can't tell you definitively - but amnio can - hence why it really won't be recommended as an option unless high risk and age factors cos of the associated risk of potential m/c.

I had it screening with both my kids, but I was 31 already with my first.

If you just wanna see the heartbeat and all the bits etc, just ask for a normal obstetric scan - half the price too

Good luck!