Test results

Just curious...
If I got my test results back for like all trisomy and Down's syndrome, and chromosomal abnormality was all negative (this was around 12 weeks, I'm now 15.) and good does that mean I don't have to worry about that kind of stuff happening anymore through out my pregnancy??? I keep worrying everyday somethings gonna go wrong..
I don't smoke, drink or anything 
Eat good, but I know that stuff can happen either way...