I am 11 weeks pregnant & i got a request for another test to check the baby for down syndrome. the last result came back as 1/1000-intimidate risk. how worried should i be?

Hard to say: The type of test was not mentioned but is likely a screening test. Screening just uses a cheaper test to select those who may be at higher risk for a more expensive & more dependable test. The NIPS is a test on maternal blood after 10 wks that can identify fetal cells & use them to confirm/exclude DS and many other defects. (>99% accurate) I wouldn't stress at this point.