Regular prenatal screening or those private company tests for abnormalities?

Vee💃 • First pregnancy 😘 EDD: Nov. 1, 2015 😁👪❤️
I'm 19, relatively healthy etc but due to my lifestyle of drinking/smoking etc before pregnancy im kind of worried but everything looks normal so far. Test or no test? If test, is it worth it to pay up to 200$ for the more accurate one? 

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