Just to add your results are still in a very low risk range but if you are concerned speak to your midwife and she will arrange a consultation with the screening department I imagine
NHS recently changed parameters so 1:5000 is now the lowest risk you can get.
Hi! I had a 1 in 7 chance and as you can imagine I was terrified with such a high risk. I had extra testing (amniocentesis) in Oxford and it all came back clear