HELP please... Screening test results

Not entirely sure what group thos post falls under but really need some reassurance/info/experiences mainly from UK mums of possible due to terminology.

Had my screening done on Wednesday. I was 12 weeks and 5 days (currently 13 weeks apparently)

We saw a gorgeous baby moving around like crazy. Stretching, turning around etc.

All was great until the lady told us that the NT (fluid at the back of baby's neck) is 3.6mm when the cut off for UK is 3.5mm

They took blood tests which showed 1 in 52 chance of baby having Down Syndrome given the NT result and my age (I will be 29 in April)

They have referred me for additional tests and we agreed for the non invasive test but results will come back within two weeks from Monday. They also mentioned we can do the diagnostic test which has 0.5% to 1% of miscarriage (the one with the needle through the tummy and takes a sample from the placenta?) . Has anyone done this?

I am really freaking out and don't know what to do. Crying every day

Please if anyone has experienced this, could you please give me some more info?

Thank you in advance