NT Scan results

HI, on monday i had the NT scan where the back of the babies neck was measured, and i had prev had all the blood results done, my obs said to us on Monday to ring back today and get the results for our chance of having a DS baby etc. so i rang the Obs and spoke to his receptionist, she said its all normal and i dont have to do any further testing and they will see me at my 19week scan (6weeks time) i said to her is there an odds for the chance, and she said no its just all normal. he said on monday that my chance was low risk due to the measurement of the neck, But should i call back, do u think she may have thought i was talking about other blood tests i had done? i dont want to drive them crazy...