Fetal fibronectin test

Hello!
Has anyone else had the fetal fibronectin test done? I've been having contractions on and off so my dr did the test yesterday - it came back positive. I am 30 weeks 2 days, second pregnancy. he told me they aren't the best test, but was good to have as an informative tool either way. Anyone else had one done or in the same boat? 

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